10 U.S.C. § 7151Section
§ 7151. Commissioned officer grades
The commissioned grades in the Regular Army are:
(1) Major general.
(2) Brigadier general.
(3) Colonel.
(4) Lieutenant colonel.
(5) Major.
(6) Captain.
(7) First lieutenant.
(8) Second lieutenant.
(Aug. 10, 1956, ch. 1041, 70A Stat. 181, §3281; renumbered §7151, Pub. L. 115–232, div. A, title VIII, §808(b)(3), Aug. 13, 2018, 132 Stat. 1838.)