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Flashcards in Know these Deck (31)
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1

Whats FM's cover Machine gun employment

FM 3-22.68
FM 3-21.8

2

Describe the Cone of Fire

Each round fired in a burst from the same weapon has a slightly different trajectory.

The pattern these rounds create on way to the target is the Cone of Fire

3

What is the Beaten Zone

The Beaten Zone is the elliptical pattern formed when rounds within the Cone of Fire strike the ground or target and is the Primary way of adjusting fire.

85% of the rounds fall is considered effective Beaten Zone

4

What is Danger Space

Space between the machine gun and the target where trajectory rises less that 1.8m above the ground.

5

What are the three Classes of Fire

Respect to the Ground

Respect to the Target

Respect to the Weapon

6

What are the two subcategories of Respect to the Ground

Grazing Fire: When the center of the cone of fire is less than 1m above the ground.

Plunging Fire: When Danger Space is within the Beaten Zone

7

What are the six subcategories to Respect to the Weapon

Fixed
Traversing Fire
Searching Fire
Traversing and Searching Fire
Swinging Traverse
Free Gun

8

What are the four subcategories to Respect to the Target

Frontal Fire
Flanking Fire
Oblique Fire
Enfilade Fire

9

What are the appropriate fires for respective targets

Point Targets - Fixed
Area Targets - Traversing and Searching
Linear Targets - Traversing Fire
Deep Targets - Searching Fire
Linear Target with Depth - Traversing and Searching

10

What is Overhead fires

Only delivered from Tripod or Vehicle using T&E and friendlies between 350-850m

11

What is a Defilade Position

When MG and Crew are completely masked by terrain from the enemy. Observer Controls fire from Defilade

12

What are the six Methods of Fire Control

Prearranged Signals
Range Cards
Personal Contact
Verbal
Hand/Arm Signal
SOP's

13

What are the six Fire Commands

Alert
Direction
Description
Range
Method of Fire
Command to fire

14

What are the Principles of Machine Gun Employment

Mutual Support
Coordination
Interlocking Fire
Sited in Defilade
Sited to Produce Enfilade Fire
Cover and Concealment
Economy of Ammunition

15

What are the Sustained rates of Fire for M249, M-60, & M240B

M249: 50 RNDs/MIN, 3-5 RND burst

M60/240B: 100 RND/MIN, 6-9 RND burst

Barrel change every 10 minute

16

What are the Rapid rates of Fire for M249, M-60, & M240B

M249: 100 RNDs/MIN, 6-8 RND burst

M60/240B: 200 RND/MIN, 10-12 RND burst

Barrel change every 2 minute

17

What are the Cyclic rates of Fire for M249, M-60, & M240B

M249: 850 RNDs/MIN

M60: 550 RND/MIN

240B: 650-950RND/MIN

Barrel change every 1 minute

18

What is the DA Form for a Range Card

DA Form 5517
x2 Copies

19

What is Final Protective Fire (FPF)

An immediate prearranged barrier of fire to stop enemy movement across defense lines or areas

20

What is Final Protective Line (FPL)

Predetermined line along which grazing fire is placed to stop enemy assault.

Fixed in direction and elevation.

Grazing fire over various types of terrain out to 600m.

To prevent enemy from crawling under Grazing fire, search toward by lowering the muzzle.

21

What is Dead Space

Any fold or depression in the ground that prevents a target from being engaged from a Fixed position

22

Firing Position/Table

Firing table should be 4-6 inches down with the barrel as close to the ground as possible

23

What is the highest unit level on a Ranger Card (DA Form 5517)

Company

24

Where do you put your Machine Gun in an L-Shaped Ambush

At the apex/dog leg of the L-Shaped Ambush using Searching Fire

25

Most desirable type of fire in respect to the Target

Enfilade Fire

26

What is the #1 priority target

Anything that can't destroy your weapon

27

What is the best way to Adjust Fire

The Beaten Zone, Followed by Tracer Rounds

28

What is Plunging Fire

Occurs when Danger Space is within the Beaten Zone

At longer ranges when firing from high ground to low ground

When firing into abruptly rising ground or across uneven terrain.

29

Principle Direction of Fire (PDF)

PDF is assigned to cover an area that has good fields of fire or has a likely avenue of approach.

only used is FPL is not assigned, then becomes part of unit's FPF

30

When moving from Primary fighting position to Secondary fighting position -

Leave the Tripod, take ammo and other means to fire machine gun