Here is a list of the most popular army acronyms.

REMF - Rear-Echelon Motherfucker
ATFU - Ate The Fuck Up
DILLIGAFF - Do I Look Like I Give A Flying Fuck
FIDO - Fuck It. Drive On
FIIGMO - Fuck It, I've Got My Orders
FISHDO - Fuck It, Shit Happens
FM - Fucking Magic
FNG - Fucking New Guy
FOAD - Fuck Off And Die
FODA - Fuck Off and Die Asshole
FTA - Fuck The Army
FUBAR - Fucked Up Beyond All Recognition
FUBIJAR - Fuck You Buddy, I'm Just a Reservist
FUBB - Fucked Up Beyond Belief
FUBIS - Fuck You, Buddy, I'm Shipping
FUGAZI - Fucked-up, Got Ambushed, Zipped-In
FYB - Fuck Your Buddy
JAFO - Just Another Fucking Observer
JANFU - Joint Army-Navy Fuck-up
LLMF - Lost Like a Mother Fucker
NFG - No Fucking Good
NPGs - No Pussy Getters
BCD - Birth Control Device. Refers to army issue eyeglasses
PFC - Pointless Fucking Chevron, or Proud Fucking Civilian
PFM - Pure Fucking Magic
SOS - Same Old Shit
SNAFU - Situation Normal: All Fucked Up
SRDH - Shit Rolls Down Hill
SSDD - Same Shit, Different Day
SSND - Same Shit, New Day
SWAG - Scientific Wild-Ass Guess
SST - Shit-Sucking Truck, Slang for the vehicle used to remove human waste from the portable toilets.
S-FUS - Standard Fucked Up Situation
TARFU - Things Are Really Fucked Up
YMRASU - Yes, My Retarded Ass Signed Up (US Army backwards)
WTF - What The Fuck, said as "Whiskey Tango Foxtrot" on radio's