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18B Heavy > M252 & Mortar Employment > Flashcards

M252 & Mortar Employment Flashcards

1
Q

What are the maximum and minimum degrees of angle and mil settings?

A

83* to 45*

1500mil to 800mil

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2
Q

How many mils are in one turn of the traversing and elevation knob?

A

10mils

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3
Q

Describe the 3 mortar element sizes and how many guns in each:

A

Squad: 1 gun, SL/AG/Gunner/AB
Section: 2 gun, Sec Sgt/SL/AG/Gunner/AB
Platoon: 4 gun, PL/PSG/2 Sec Sgt(FDC)/SL/AG/Gunner/AB

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4
Q

RSOP: name the factors of position selection

A 
Mission Accomplishment (most important)
Tactical situation
Range 
Target area coverage
Survivability
Overhead and mask clearance 
Surface conditions 
Communications 
Routes
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5
Q

What is the range criteria for position selection?

A

Mortars should be able to fire at least one half to two thirds of their range to the front of the forward elements of the supported friendly force.

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6
Q

What is the most important step of RSOP?

A

Mission accomplishment

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7
Q

What is the difference between deliberate and hasty occupation?

A

The amount of time to prepare position by the recon team. (Hasty may get some prep done, but very minimal. Deliberate is covering all bases)

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8
Q

Under what two conditions may you displace the gun elements?

A

If contact is unlikely and if you have support of your local unit

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9
Q

If you can’t meet displacement criteria to move all at once, how should mortar elements travel?

A

By section or squad using successive or alternating bounding

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10
Q

What are the distances of separation for 60mm, 81mm, and 120mm in parallel formations?

A

60mm-30m
81mm-40m
120mm-70m
(Bursting diameter of HE ammo)

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11
Q

What are the 3 effects of IDF and describe them

A

Suppression- lowest standard - enemy not able to do their job
Neutralize - 10% casualties
Destroy - 30% casualties

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12
Q

Name and describe the fuze types fired by the M224:

A

Multioption M734: Proximity (1-4m above surface), Near Surface Burst (0-1m above ground), Impact (super quick- on surface), Delay (0.05 seconds after impact). No safety pins.

Point detonating M935: set to superquick or delay. Has pull wire safety.

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13
Q

Which fuze type is good for troops standing in the open?

A

Impact, Point Detonate, or NSB

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14
Q

Which fuze type is good for prone targets or in shallow fighting positions?

A

PRX or delay

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15
Q

Which fuze arms in flight, sends out radio waves waiting for object to give a splash back then goes off 1m above ground?

A

NSB

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16
Q

Which fuze type can hit a jungle canopy and then detonate once closer to ground?

A

Delay

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17
Q

Who makes up a basic gun crew?

A

Squad leader, Gunner, AG, AB

18
Q

Explain the gun crew roles

A

Squad leader: supervise from rear of gun.
Gunner: on optic side, manipulates gun w firing data.
AG: opposite of Gunner, loads ammo, swabs bore, may move gun.
AB: preps ammo

19
Q

After how many rounds should AG swab the bore?

A

10 rounds or end of fire mission

20
Q

M253 cannon rates of fire

A

Sustained 15rpm Indefinitely

Max 30rpm for 2min

21
Q

Ranges for the M253 cannon

A

Minimum: 83m
Maximum: 5608m

22
Q

What power optic is the M67?

A

4x

23
Q

What is the range in mils of elevation for the M177A1 bipod?

A

0800 (max range) to 1511mils (min range)

24
Q

What is the M3A2?

A

The daggon’ baseplate

25
Q

What is total traversing in mils and also traversing from center to left or right on the bipod?

A

200m total. 100mil each way.

26
Q

Can the bubbles be touching the outermost red lines on the optic?

A

No

27
Q

What are the 3 types of mortar rounds and their respective colors?

A

HE (olive drab green)
Illum( white)
Phosphorous(light green)

28
Q

What is the M816 cartridge standard, type, range, fuze?

A

A, IR ILLUM, 5100m , M772 MTSQ

White

29
Q

What is the M819 cartridge standard, type, range, fuze?

A

A, Phosphorous, 4875m, M772 MTSQ

Light green

30
Q

What is the M821/821A1 cartridge standard, type, range, fuze?

A

A, HE, 5608m, M734 Multioption

Olive drab green

31
Q

What is the M853 cartridge standard, type, range, fuze?

A

A, Illumination, 5100m, M772 MTSQ is M768 Time

White

32
Q

What is the M879 cartridge standard, type, range, fuze?

A

A, Full Range Training Cartridge (FRTC), 5600m, M751PD

33
Q

What is the M889/889A1 cartridge standard, type, range, fuze?

A

A, HE, 5608m, M935PD

Olive drab green

34
Q

What is the weight, field of view, and magnification of the M115 boresight?

A

5oz, 17*, 1.5x

35
Q

At how many mils does the elevation bubble level?

A

800mils only

36
Q

How many degrees can the M115 be rotated in the muzzle until the second cross level bubble is centered?

A

180*

37
Q

T/F you should always calibrate the mortar sight to the mortar on which it will be mounted

A

True

38
Q

What does deflection and elevation have to be set to in order to bore sight?

A

Elevation 0800mils

Deflection 3200mils

39
Q

For m252 mortar what deflection do you put on the sight?

A

0mils

40
Q

What should the reading on the coarse elevation scale of the sight unit be set to?

And the elevation micrometer scale?

A

800 coarse

0 micrometer

41
Q

What should coarse deflection be set to?

And micrometer scale?

A

3200mils coarse

0mils micrometer

42
Q

What is a M14? How many come with the mortar? And how high may they be stacked?

A

Aiming post, 4, 2 high

18B Heavy (4 decks)

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