[veracious]

Although weapons knowledgeable, I don't know what a 240 or
AT4 is? Can someone tell me/us?

[boxerblues]

http://www.globalsecurity.org/military/systems/munitions/at4.htm

The M136 AT4 is the Army's primary light anti-tank weapon. The M136 AT4 is a recoilless rifle used primarily by Infantry Forces for engagement and defeat of light armor. The recoilless rifle design permits accurate delivery of an 84mm High Explosive Anti-Armor warhead, with negligible recoil.

[Cannoneer No. 4]

M240 General Purpose Machine Gun, 7.62mm

M136 AT4 84mm Recoiless Rifle

[finnman69]

http://www.globalsecurity.org/military/systems/ground/m240g.htm

http://www.globalsecurity.org/military/systems/munitions/at4.htm

[csvset]

Here's a pic of a sailor, (SeaBee), firing a AT4.