Master Sergeant John Kirby exchanges silver dollar salute with Princeton Army ROTC commissioning officers. June 6, 2023 Fourteen members of Princeton’s Class of 2023 became commissioned officers in the U.S. Army, Navy, Marine Corps and Air Force on May 30 during a ceremony led by Chairman of the Joint Chiefs of Staff Gen. Mark Milley, a Class of 1980 graduate who himself was commissioned through Princeton’s ROTC program more than 40 years ago.