History of the Office of The Inspector General of the United States Army (IG January 10, 1863April 1, 1864; January 2, 1881March 8, 1885) was assigned as the "de facto" head of the Office of the Inspector General, which, until then had not existed. 2 major generals, 7 brigadier generals, 18 colonels, 118 lieutenant colonels, and 149 majors of the regular army served inspector duty during the Civil War. On January 22, 1866, a War Department order established the duties of the inspector general as: In July 1866, the number of inspectors general with the rank of colonel was fixed at four; assistant inspectors general with the rank of lieutenant colonel at three;
Colonel general rank – only six officers have held this rank till now – Hafez al-Assad, Mustafa Tlass, Hikmat al-Shihabi, Ali Habib Mahmud, Dawoud Rajiha and Fahd Jassem al-Freij. The title of colonel general was used before and during the English Civil War in both Royalist and Parliamentarian armies. In these cases, it often appears to have meant a senior colonel as opposed to a senior general. In the United States, as commander of an army, the equivalent rank was general (four-star general, grade O-10). In Vietnam, the rank of colonel general is known as "thượng tướng" (literally "upper general"), equivalent to