From 3 July 1900 to 12 November 1900, Captain Lejeune was assigned to recruiting duty at Boston, Massachusetts. On November 22, 1900, he reported at the Marine Barracks, Pensacola, Florida, to command a Marine detachment there. From 12 January 1903 to 21 January 1903, Captain Lejeune was on duty at the Norfolk Barracks, he was en route to duty at New York City on 26 January 1903. He was promoted to major on 3 March 1903 and was on duty assigned to Headquarters Marine Corps in Washington, D.C. from 15 May 1903 to 8 August 1903.