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Though students at Texas A&M are technically required to participate in the Corps, the majority of incoming students are excused by the University Administration and the Commandant. Sasser, class of 1973 * For the school's first thirty-one years, through the 1907–08 academic year, the Cadet Corps was organized into one battalion consisting of two to four companies, designated companies "A", "B", "C", and "D".
Those who elect to join the Corps must participate in mandatory Reserve Officer Training Corps (ROTC) courses and training for the first two years, but these are optional for junior and senior year cadets. Early on, these were designated "Infantry" companies, but the Commandant ensured that Artillery training was included in the military instruction.
During this post-war era and into the 1950s, the various units of the Corps continued to be identified by their military branch.The traditional branches (Infantry, Field Artillery, Cavalry, Engineers, Coast Artillery, Quartermaster, Ordnance, Signal Corps, Armor, Chemical Corps, Transportation, Army Security, and Army Air Force) continued to be represented.But the strength of air power and the rise of the importance of the U. Air Force during this era was evident in the organization of the Cadet Corps as Army Air Corps units became Air Force flights (later squadrons).Texas A&M remained a primarily all-male military institution with mandatory membership in the Cadet Corps until 1964, when the school also began admitting women, and 1965 when Corps membership became voluntary. As enrollment climbed, the Cadet Corps continued to grow to multiple battalions, each with two to four companies, and the Corps became divided into multiple regiments.
Members of the Cadet Corps have served in every conflict fought by the United States since the Spanish–American War. The academic year 1916–17 saw the division of the Corps into two regiments.Juniors and seniors who do not have military contracts to receive commissions, but who wish to remain members of the Cadet Corps, are classified as "Drill & Ceremonies" (D&C) cadets and are required to attend leadership classes taught by the Commandant's Office. The Aggie Band was organized in 1894 as a permanent institution within the Corps.