The air staff remained small, but Sperrle's contingent were present in the 4,000 officers retained in the military. In 1927 Sperrle, at the rank of "Major", replaced Wilberg as head of the air staff at the Waffenamt an Truppenamt (Weapons and Troop Office). Sperrle was selected for his expertise in technical matters; he was seen as highly qualified staff officer with combat experience in commanding the flying units of the 7th army during the war. On 1 February 1929 Sperrle was replaced with Hellmuth Felmy. Sperrle's departure came as he was pressing for an autonomous aviation authority. Felmy persisted, and on 1 October 1929, the Inspektion der Waffenschulen und der Luftwaffe came into existence under the command of Major General Hilmar von Mittelberger—it was the first use of the term "Luftwaffe". By 1 November 1930, the embryonic air headquarters could count 168 aviation officers including Sperrle.