434 Operational Test and Evaluation Squadron is a Royal Canadian Air Force bomber squadron that flew bombing operations over Europe during World War II and was later a post-war fighter and combat support unit.

After VE Day the squadron was earmarked for Tiger Force to carry on the war against Japan, but was never deployed to the Far East.

[1][2] During World War II the unit flew 198 missions, including 179 bombing, 17 mine laying, one diversionary and one sea search.

434 Squadron suffered 75 aircraft lost, 484 aircrew operational casualties, including 34 killed, 313 presumed dead, 121 made prisoners and 16 who evaded capture and escaped.

The name was changed to 434 Combat Support Squadron and the unit moved to CFB Greenwood in mid-1995, flying the CC-144 Challenger and Canadair CT-133 Silver Star in the electronic warfare role.