280mm Atomic Cannon (Photo submitted by Herbert Hept who served with a German Bundeswehr engineer unit) Numerous high ranking officers of the 11th and 555th Engineer Groups (Cbt) witness the art of loading an M-65 280mm atomic cannon onto the new 100 Class Raft operated by the 8591st Labor Service Group (6960th LS Bn) at Brühl on the Rhine River.