Update; 06/12/13 10: 39 hours this was just the title change.
Tuesday, May 28, 2013
Post # 43, Preparations and Conduct of Patrols, rule # 11
AHOY,
Update; 06/12/13 10: 39 hours this was just the title change.
Update; 06/12/13 10: 39 hours this was just the title change.
FRAGMENTED FIGHTING FACTS
Preparations and Conduct of Patrols
Basic rule # 11
11) Keep distance:
Second in command in stern of patrol, first up front. For patrol members, dispersed at 45’-55’ feet
intervals, if terrain allows. Dispersion reduces WIA especially if enemy fire
hits ammo of crew served weapons or grenades. It also makes it more difficult
for enemy to get a count, as he must wait longer for patrol to pass.
With groups, this could be not everyone leaving at the same time to go to
the same i.e. next location. Or not setting i.e. hanging out with each other
once everyone arrives. Members could play it casual gradually introducing one
another and joining up at a certain table as security situation is assessed.
In dessert, large units
should converge on objective than scatter as an anti counter attack tactic,
especially from air. Also recon units stay farther away from main units and
move in deceptive directions from main units.
MOUNTAINEERING; Route Selection; Crossing re-entrants as near to the
watershed as possible. (All the land area
that drains into a stream system is called a watershed) Bad weather limiting visibility can lift quickly.
Don’t get caught in open areas or camp in them. In general the shortest route
was not always the quickest; the trick was to avoid obstacles such as cliffs,
quarries scree/rocks, bracken, ice, snow and bogs. Often the best descent is on
a different route than the ascent. When looking for a firmer surface, watch for
darker/dirty/settled snow this absorbs more heat and thus hardens faster than
lighter/clean/fresh snow. Windward sides more packed easier traveled. Pick
route where you can traverse downhill as quickly as possible. When you must
ascend a dangerous slope, climb to the side of the avalanche path, and not
directly up the center. Since most avalanches occur within 24 hours of a storm
and or at midday, avoid moving during these periods. Units should travel before
sun up, not at noon, not during unusually high or low temperatures. Late night
or early morning patrols are best especially if daytime temperatures are going
to rise above freeing. Avoid cornices from above or below. Avoid convex slopes
stay high in slopes or low in tree line. You have to pace yourself, breath and
march rhythmically. Traversing the slope in a zigzag i.e. switch back manner.
The number of stragglers may be expected to increase. You had to make up time
by running down the easy slopes. On the uphill keep your feet horizontal on the
slopes. Avoid areas next to logs, rocks, trees, where the surrounding snow has
melted away, creating hidden ice hazards. Cross danger areas one at a time. Use
same path, keep mouth covered with cloth, loosen or remove skies. Remove your
hands from ski pole wrist straps. Detach ski runaway cords. Prepare to discard
equipment. Put your hood on. Close up your clothing. Deploy avalanche cord.
Make avalanche probes and shovels accessible. If caught in slid swim or roll,
working towards the edge of the avalanche. If you feel your feet touch the
ground, give a hard push and try to "pop out" onto the surface. If
buried spitting can help determine up or down, also throbbing in head. When
your buried your breath fresses around your head trapping the carbon dioxide
and you are asphyxiated. Avalanches accounted for more than ½ the KIA during
alpine fighting in WW1.
AVALANCHE SEARCH AND RESCUE
TECHNIQUES; when the snow comes to rest it sets up like cement. Don’t shout
unless you hear rescuers immediately above you; in snow, no one can hear you
scream. The respiration of an unconscious person is shallower, their pulse rate
declines, and the body temperature is lowered, all of which reduce the amount
of oxygen needed. Chances of survival after burial by an avalanche are
approximately 90 % if the victim is located within 15 minutes. However,
probability of survival drops rapidly and, after two hours, chances of survival
are remote. Suffocation accounts for 65 % of fatalities, collision with debris
accounts for 25 % and hypothermia and shock accounts for 10 %. In many
respects, a moving avalanche resembles a liquid. A human body, with a higher
density than the flowing snow, would be expected to sink deeper and deeper into
the avalanche; however, several factors influence the body's location.
Turbulence, terrain, and the victim's own efforts to extricate himself all
interact to determine the final burial position. Efforts of the victim to
extricate himself by vigorous motion and "swimming" definitely
minimize burial depth. Conversely, the limp body of an unconscious victim is
likely to be buried deeply. If any indication of the location of the victim is
found, random probing starts in that vicinity. Establish from witnesses where
the victim was located just before the avalanche to determine the point where
the victim disappeared the "last seen" point. Using this and any
other information, establish a probable victim trajectory line leading to high
priority search areas. If two points of the victim's trajectory can be
established, a high probability exists that the victim will be near the
downhill flow line passing through these two points. The tip and edges of the
slide are also likely areas to search. A human body is bulky and is apt to be
thrown toward the surface or the sides. The majority of buried victims are
carried to the place of greatest deposition, usually the toe of the slide. Any
terrain features that catches debris are also apt to catch a victim. The
likelihood of a victim being buried in a particular bend is proportional to the
amount of debris deposited there. The victim tends to be retained above the
obstacle. An obstacle may simply delay the victim's motion, leading to final
burial down flow from the obstacle. Maximum speed of the flowing snow occurs at
the avalanche center. Friction reduces flow velocity along the edges. The
closer the victim's trajectory is to the center of the slide, the greater will
be his burial depth. Probing for victims;
probe Poles, 10 feet long two
ski or tent pools, designed to attach to each other. The ski pole can be
reversed, probing with the wrist strap down; or the basket can be removed so
that the point is down (the preferred method), which allows the ski pole to
penetrate the snow more easily. Probing Lines; for the probing
operation to be effective, probing lines must be orderly and properly spaced.
To ensure systematic and orderly probing. A string may be used to keep the
probe lines aligned, but will require added time to maintain. Probing does not
come to a halt when a possible contact is made. The probe is left in contact
and the line continues. A shovel crew follows up by digging down along the
pole. Dig in shifts, one standing by to assist when needed. Such a plan of
operation is especially important when more than one victim is buried. Striking
a body gives a distinct feel to the probe, which is easily recognizable in soft
snow but less recognizable in hard compacted snow. A common problem is
encountering debris that can be mistaken for the victim. Debris usually much
more solid causing vibrations through probe. The probers themselves work
silently. Probers are spaced the same as for the coarse probe. Each man
probes in front of his left foot, then in the center of his straddled position,
and finally in front of his right foot, then does the reverse. Types and characteristics; Starting points
average 10 k’. Speeds average 200 mph. Slope Aspect; any slope of fresh snow (which dose
not cohere) with an angle of repose of around 25 degrees or steeper suspect
until it settles, Slopes as
gentle as 15 degrees have avalanched. Most avalanches occur on slopes between
30 and 45 degrees. Slopes above 60 degrees often do not build up significant
quantities of snow. When the avalanche danger is high avoid Northern, eastern
and southern facing slopes? South and west slopes are harder and harden earlier
in season and after storms? Most prone to avalanches in spring. Snow on north
facing slopes is more likely to slide in midwinter. South facing slopes are
most dangerous in the spring and on sunny, warm days. Slopes on the windward
side are generally more stable than leeward slopes. Loose snow (aka point) avalanches; dangers of powder snow slides
are suffocation or being swept over cliffs. Start at one point on the snow
cover and grow in the shape of an inverted "V." Most
frequently during the winter snow season. They often fall as many small sluffs
during or shortly after a storm. This process removes snow from steep upper
slopes and either stabilizes lower slopes or loads them with additional snow. Wet loose snow avalanches, large
avalanches of this type, lubricated and weighed down by melting water or rain
can travel long distances and have tremendous destructive power. Coastal ranges
that have high temperatures and frequent rain are the most common areas for this
type of avalanche. Occur in spring and summer. Slab avalanches are generally considered more dangerous than loose
snow avalanches. Slab release is rapid. Are more likely to occur on convex
slopes when cohesive snow begins to slide on a weak layer. The fracture line
where the moving snow breaks away from the snow pack makes this type of
avalanche easy to identify. Slides of wet snow freezes more solidly upon
stopping. Settled snow looks darker than new flake. Compacted snow normally
will not avalanche. Ground Cover
rough terrain is more stable than smooth terrain. On grass, scree or on
smooth rock, the snow has little to anchor to so slopes of even moderate
steepness, are liable to avalanche. Or if seeping water peculates under snow
forming ice base. Evidence of Avalanching look for recent avalanches and for signs of wind-loading and
wind-slabs. Fracture Lines avoid
any slopes showing cracks. Sounds beware
of hollow sounds a "whumping" noise. They may suggest a radical
settling of the snow pack.
TRIGGERS; Vibration, earth
tremors have triggered avalanches. Units should always trigger avalanches
before crossing if tactical situation permits. Using passing helicopters, heavy
equipment, explosions.
Temperature,
early ski mountaineers in the
Alps noticed that avalanches sometimes occurred when shadows struck a
previously sun-warmed slope. When the temperature is extremely low, settlement
and adhesion occur slowly. Avalanches that occur during extreme cold weather
usually occur during or immediately following a storm. At a temperature just
below freezing, the snow pack stabilizes quickly. At temperatures above
freezing, especially if temperatures rise quickly, the potential for avalanche
is high. Rapid temperature changes, packed snow expands and contracts with temperature
changes. For normal density, settled snow, a drop in temperature of 10 degrees
Celsius (18 degrees Fahrenheit) would cause a snow slope 300 meters wide to
contract 2 centimeters. Precipitation,
storms can deposit dry snow early, which bonds poorly with the heavier snow
deposited later. About 90 % of avalanches occur during or within twenty-four
hours after a snowstorm. The rate at which snow falls is important. High rates
of snowfall (2.5 centimeters per hour or greater?), especially when accompanied
by wind, are usually responsible for major periods of avalanche activity. Rain
falling on snow will increase its weight and weakens the snow pack. Wind, sustained winds of 15 mph
and over transport snow and form wind slabs on the lee side of slopes.
TEST; Snow Pits; snow pits can be used to
determine slope stability. Dig the snow pit on the suspect slope or a slope
with the same sun and wind conditions. Snow deposits may vary greatly within a
few meters due to wind and sun variations. Dig a 2-meter by 2-meter pit across
the fall line, down to ground level. Once the pit is complete, smooth the face
with a shovel. Conduct a shovel shear
test; a shovel shear test puts pressure on a representative sample of the
snow pack. The core of this test is to isolate a column of the snow pack from
three sides. The column should be of similar size to the blade of the shovel.
Dig out the sides of the column without pressing against the column with the
shovel (this affects the strength). To isolate the rear of the column, use a
rope or string to saw from side to side to the base of the column. If the
column remained standing while cutting the rear, place the shovel face down on
the top of the column. Tap with varying degrees of strength on the shovel to
see what force it takes to create movement on the bed of the column. The
surface that eventually slides will be the layer to look at closer. This test
provides a better understanding of the snow pack strength. For greater results
you will need to do this test in many areas and formulate a scale for the
varying methods of tapping the shovel i.e. shovel lifted to a constant height
before dropping onto column. Conduct a Rutschblock
test; to conduct the test, isolate a
column slightly longer than the length of your snowshoes or skis (same method
as for the shovel shear test). One person moves on their skis or snowshoes
above the block without disturbing the block. Once above, the person carefully
places one snowshoe or ski onto the block with no body weight for the first
stage of the test. The next stage is adding weight to the first leg. Next,
place the other foot on the block. If the block is still holding up, squat
once, then twice, and so on. The remaining stage is to jump up and land on the
block.
(Reference, Step # 3 Concepts of
Operations, part B) maps, models and weather. COE rule # 3 Formations “men
learned” and rule # 5. And Appendix PCP rule # 13 for information on glaciers
and Appendix MM&W for more information)
This concludes this post of Preparations and Conduct
of Patrols, Basic rule # 11
" Give me a million dollars and I well change the
world"
" When it comes to persecution and suffering that fairly
tale about christ dose not have (S) nothing on me"
" I well bet my lucky start"
“IKYG”
G-day!
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