Due to several different .222 caliber cartridges being developed for the SCHV project, the 222 Special was renamed .223 Remington in 1959. In May of that year, a report was produced stating that five- to seven-man squads armed with AR-15 rifles had higher hit probabilities than 11-man squads armed with M-14 rifles. At a picnic, Air Force General Curtis LeMay fired an AR-15 and was very impressed with it. He ordered a number of them to replace M2 carbines that were in use by the Air Force. By November, testing at Aberdeen Proving Ground showed that the AR-15 failure rate had declined to 2.5 failures per 1,000 rounds, resulting in the M-16 being approved for Air Force Trials.