10 U.S.C. § 9110 Regular Air Force: strength in grade; general officers
(a) Subject to section 526 of this title, the authorized strength of the Regular Air Force in general officers on the active-duty list is 75/10,000 of the authorized strength of the Regular Air Force in commissioned officers on the active-duty list. Of this authorized strength, not more than one-half may be in a regular grade above brigadier general.
(b) When the application of subsection (a) results in a fraction, a fraction of one-half or more is counted as one, and a fraction of less than one-half is disregarded.
(c) General officers on the active-duty list of the Regular Air Force who are specifically authorized by law to hold a civil office under the United States, or an instrumentality thereof, are not counted in determining authorized strength under this section.