Australian Centurion tank crewmen, artillerymen, infantrymen, and they flew B-57 Canberra bombers in Vietnam.

The Canberra had many variants and while in RAF and USAF it was a bomber. photo-recce or EW aircraft. However it may have been used as a fighter bomber by some of the smaller airforces who used it. It could carry gunpacks.

The expression is: 57+b

C-A-N-B-E-R-R-A

Australia's navy was pounding the coast from the gunline, it's air force was flying B-57 Canberra bombers, and it's army was fighting on the ground in South Vietnam with Centurion tanks, infantrymen, and artillery.