These arethe abbreviations used in the Tactical Organization and Equipment lists.

AA: anti-aircraft
AALMG: LMG mounted on tripod for AA purposes
A/C: armoured car
ACV: armoured command vehicle
AFV: armoured fighting vehicle
ARV: armoured recovery vehicle
A/T: anti-tank
AVLB: armoured bridgelayer
BAR: Browning Automatic Rifle
BHQ: Battlegroup headquarters
Bttn HQ: Battalion headquarters
Bttn: Battalion
CHQ: company headquarters
demo: demolition
FG42: German Paratroop weapon, can be used as sniper's rifle, LMG or assault rifle as desired.
Flak.Pz: Flakpanzer - anti-aircraft tank
flamegun: flamethrower
GPMG: general purpose machine gun (MG34 or 42)
HMC: howitzer motor carriage
HMG: heavy machine gun on tripod in 12.7mm class of weapon
HQ: Headquarters
H/T: halftrack
LMG: light machine gun (Bren, etc)
MMG: medium machine gun on tripod of rifle calibre
MP44: German assualt rifles
OP: Observation Post, also known as FOO.
PHQ: Platoon headquarters
Pz.: Panzer - German tank
Pz.Bef.#: Panzerbefelswagen - German command tank
Pzshreck: Panzershreck anti-tank rocket launcher
RHQ: Regiment headquarters
S/C: scout car
SHQ: Squadron headquarters
SMG: sub-machine gun
smk: smoke
SP: Self-propelled
SPG: self-propelled gun
sqd: squad or section of about 10 men
WP: White Phosphorous