Machine Gun Employment

Question 1

Which FM’s cover machine gun employment?

Answer 1

FM 3-22.68 crew served MGs 5.56mm and 7.62mm

FM 3-21.8 infantry PLT and SQD machine guns and machine gun gunnery

Question 2

Describe cone of fire

Answer 2

Each round fired in a burst will have a different trajectory, the pattern created is called the cone of fire.

Question 3

What is beaten zone?

Answer 3

Elliptical pattern formed on the ground of the target by the striking rounds

Question 4

What is danger space?

Answer 4

Space between the MG and the TGT where the trajectory rises less then 1.8 m above the ground

Question 5

What are the 3 classes of fire?

Answer 5

Respect to the ground
Respect to the gun
Respect to the target

Question 6

What are the 2 subcategories For respect to the ground?

Answer 6

Grazing fire: when the center of the cone of fire rises less then 1 meter above the ground

Plunging fire: when danger space is within the beaten zone

Question 7

What are the 6 subcategories of respect to the gun?

Answer 7

Fixed, traversing, searching, search and traverse, swinging traverse, free gun

Question 8

What are the 4 subcategories of respect to the target?

Answer 8

Frontal fire, flanking fire, oblique fire, enfilade fire

Question 9

What are the appropriate fires for respective targets?
Point 
Area
Linear 
Deep
Linear w/depth

Answer 9

Point target- fixed 
Area target- search and traverse 
Linear targets- traverse 
Deep targets- search 
Linear targets w/depth- search  and traverse

Question 10

What is overhead fires?

Answer 10

Fires only delivered from Tripod or Vehicles using T&E and friendlies between 350-850m

Question 11

What is a defilade position?

Answer 11

When the MG and crew are completely masked by terrain from enemy

Question 12

What are the 6 methods of fire control?

Answer 12

Prearranged signals 
Range cards 
Personal contact 
Verbal
Hand/arm signals 
SOP’s

Question 13

What are the 6 fire commands?

Answer 13

Alert
Direction 
Description
Range 
Method of fire 
Command to open fire

Question 14

What are the 7 principals of MG support?

Answer 14

Mutual support 
Economy of ammo
Sited in defilade 
Sited to produce enfilade fire
Coordination
Cover and concealment 
Interlocking fire

Question 15

What is the DA form for a range card?

Answer 15

DA form 5517

Question 16

What is the gunners rule?

Answer 16

Can be applied when friendly Troops are at least 350m in front of the gun position and the range to target is 850m or less.

Question 17

What are 2 ways to determine round impact?

Answer 17

Beaten zone

Tracers

Question 18

How do gunners work in pairs?

Answer 18

By dividing the target area into 2 sections using midpoints references
Both gunners distribute fire by applying direction and elevation for the best coverage

Question 19

Employment of MG in the defense has how many positions?

Answer 19

3
Primary
Alternate- different position same mission
Secondary- different position and mission

Question 20

How many types of wire are there and what are they?

Answer 20

3
Protective wire- 35m outside hand grenade range outside defense trace
Tactical wire- meant to funnel enemy to focus fires on them
Supplementary wire- hide tactical wire and confuse the enemy

Question 21

What are the 2 techniques for air defense for MGs?

Answer 21

Football field technique

Reference point technique

Question 22

What are the 2 football field techniques?

Answer 22

Fast- 2 football field lead

Slow- 1/2 lead

Question 23

What is the purpose of a range card?

Answer 23

To provide a record of firing data and aids defending fire planning

Question 24

How many copies of the range card is prepared?

Answer 24

2 copies

Question 25

Who are the ranges cards for?

Answer 25

1 for the MG position | 1 for squad leader

Question 26

What is FPF final protective fire?

Answer 26

Immediate prearranged barrier of fire to stop enemy movement across defensive lines or areas

Question 27

What is FPL final protective line?

Answer 27

Predetermined line along which grazing fire is placed to stop enemy assault, fixed in direction and elevation

Question 28

What is dead space?

Answer 28

Areas where a soldiers waist falls below the gunners point of aim.

Question 29

What is maximum ordinate?

Answer 29

The highest point above the line of sight the trajectory reaches between the muzzle of the weapon and the base of the target

Question 30

What is trajectory?

Answer 30

The path the projectile takes from the muzzle of the weapon to the target

Question 31

What are the 8 principles of machine gun employment? | PICMDEEP

Answer 31

``` Pairs Interlocking fires Coordination of fires Mutual support Defilade Enfilade Economy Protection ```

Question 32

What do machine guns work in pairs?

Answer 32

Ammo conservation Less wear and tear on weapons Less barrel changes Cover more area

Question 33

What is the mil range for elevation and traverse on the M192 tripod?

Answer 33

530mils -elevation | 900mils -traverse

Question 34

How many mils can you elevate and depress the gun? And in how many increments? M192

Answer 34

235 mils- up 375 mils- down 10 mil increments

Question 35

What is the traverse scale numbering from right to left? M192

Answer 35

0-far right | 900- far left

Question 36

On the minor scale one full rotation of the lever moves the weapon how many mils? M192

Answer 36

5 mils

Question 37

Rotating the lever half way moves the weapon how many mils? M192

Answer 37

1 mil

Question 38

The T&E scale major and minor are divided into how many increments? m192

Answer 38

Major- 5 mils | Minor- 1 mil

Question 39

What is grazing fire?

Answer 39

Center of the cone of fire rises less then 1 meter above the ground

Question 40

What is plunge fire?

Answer 40

When the danger space is within the beaten zone

Question 41

What is the mil range for traverse on the M122?

Answer 41

Numbered every 100 mils to 425 mils right of center 100 mils to 450 mils left of center

Question 42

Each click on the traversing hand wheel indicate how many mils?

Answer 42

1 click equals 1 mil

Question 43

What are the total number of traversable mils on the M122?

Answer 43

100 mils | 50 mils left and 50 mils right of center

Question 44

One click on the elevation hand wheel equals how many mils?

Answer 44

1 click equals 1 mil

Question 45

How many mils are available in elevation change?

Answer 45

400 mils | 200 above and 200 below

Question 46

Engraved into the handwheel is a scale divided into what?

Answer 46

5-mil divisions and 1-mil subdivisions

Question 47

What’s the total number of mils on the hand wheel?

Answer 47

50 mils

Question 48

Elevation readings are taken in how many parts?

Answer 48

2 parts Major(elevation screw plate) Minor(hand wheel)

Question 49

What is the sustained rate of fire for the M249, M60,M240B?

Answer 49

M249- 50 rounds/Min 3-5 rd burst M60/M240- 100 rounds/min 6-9 rd burst Barrel change every 10 mins

Question 50

What is the rapid rate of fire for the M249, M60, M240B?

Answer 50

M249- 100 rounds/min 6-8 round burst M60/M240-200 rounds/min 10-12 round hurst Barre change every 2 mins

Question 51

What is the cyclic rate of fire for the M249, M60, M240B?

Answer 51

M249- 850 rounds/min M60- 550 rounds/min M240B- 650-950 rounds/min Barrel change every 1 min

Question 52

What is the max effective range for grazing fire?

Answer 52

600m

Question 53

How high does the barrel need to be when emplacing a firing table?

Answer 53

4-6 inch’s of the ground