Well it depends on which army you are talking about.
Actually it does not matter what army you are talking about. From the Romans to the U.S. military the oldest profession in an army is Infantry!
Women's Army Corps ended in 1978.
V Army Corps - Germany - was created in 1934.
The US Army Corps of Engineers, they became responsible for protecting US waters with the Rivers and Harbors Act of 1899.
XXIV Corps - Union Army - was created in 1864.
Royal Army Dental Corps was created in 1921.
Judith A. Bellafaire has written: 'The Women's Army Corps' -- subject(s): History, United States, United States. Army. Women's Army Corps, Women, World War, 1939-1945 'The Army Nurse Corps' -- subject(s): History, Military nursing, United States, United States. Army Nurse Corps, United States. Nurse Corps 'The Army Nurse Corps in World War II'
Frederick Smith has written: 'A history of the Royal Army Veterinary Corps 1796-1919' -- subject(s): Great Britain, Great Britain. Army. Royal Army Veterinary Corps 'Cayman Islands'
Michael E. Welsh has written: 'A mission in the desert' -- subject(s): History, United States, United States. Army. Corps of Engineers. Albuquerque District 'U.S. Army Corps of Engineers, Albuquerque District, 1935-1985' -- subject(s): History, United States, United States. Army. Corps of Engineers. Albuquerque District
PAK ARMY have 9 CORPS
Spanish Marine Corps is oldest: since 1537 Dutch Marine Corps (Korps Mariniers) 2nd oldest: since 1665
It's Cadwalader. Actually, the oldest law firm in the United States is the US Army JAG Corps, established in 1775.
Womens Army Corp
Second Army Corps was created in 1898.
I Army Corps - Greece - was created in 1913.
Corps of Army Music was created in 1994.
Army Catering Corps ended in 1993.
Army Catering Corps was created in 1965.