I believe FUBAR as used in the US military actually refers to 'Fucked up Beyond All Repair' - courtesy of an ex-US Navy friend of mine - although seeker's version may be used in different sections of the military or even Atlantic vs. Pacific fleet (The most notable source of this variant being the appalling film 'Tango and Cash', starring Kurt Russel and Sylvester Stallone).

There is a graded system of descriptors - SNAFU (Situation normal - All fucked up) and FUBAR being two of them.

Elgon