re:
KevinB's Post, #95 in this thread
and
http://www.m4carbine.net/showthread.php?p=471790
and post #120 below
I had to look up a bunch of the acronyms.
AFSOC: Air Force Special Operations Command
AOR: area of responsibility
CF: Canadian Forces
COP: Combat Operating Post
FOB: forward operating base
FOW: Family of Weapons
KD Range: Known Distance range
LAV: Light Armored Vehicle
LAV-3:
http://en.wikipedia.org/wiki/LAV_III
M855: 5.56mm ammunition cartridge that is used in the M16 and the M4 rifles
NSN: National Stock Number
OEF: Operation Enduring Freedom
OIF: Operation Iraqi Freedom
OTM: Open Tip Match
PM: Preventative Maintenance
PMA

Polymer MAGazine. Is a lightweight 5.56 NATO, M-16 compatible magazine.
QRF: Quick Reaction Force
Quad 50's:
http://www.rt66.com/~korteng/SmallArms/50quad.htm
TIC: Troops In Contact
The M4 has selective fire options including semi-automatic and three-round burst (like the M16A2), while the M4A1 has a "full auto" option in place of the three-round burst.
I never did find out what FOW was (as in 'M16FOW'). Although "FOrge Welded" was a possibility. "Fog Of War" didn't seem appropriate.