In late 1971, the team worked with the 604th Special Operations Squadron A-37 pilots at Bien Hoa Air Base to fly a handful of combat test missions.
In December of that year, that same team came to Nahkon Phanom Royal Thai Air Base (NKP) to do the same tests with the 1st Special Operation Squadron, flying the A-1.
Also, the very high drag characteristics of the CBU-55 canister, with its flat back end, severely limited the A-1's ability to carry other bombs, rockets, and CBU, a further negative issue.
In February/March 1972 US Navy Light Attack Squadron 4 (VAL-4) based at Can Tho delivered several sorties with the OV-10 Bronco, in support of US Army and ARVN joint operations north of the Mekong River.
Although the Air Force chose, based on the Bien Hoa and NKP tests, not to deploy the weapon to the two combat units in-theater, an inventory of the canisters was kept.