Military services again requiring recruits to get flu shots as Air Force outbreak grows. In April, Hegseth said the flu shot would be optional for military personnel. By Dr. Jade Cobern, Luis Martinez, Mary Kekatos, and Steve Beynon. June 23, 2026, 8:04 PM. U.S. ARMY JOIN. NTONIO. .nnex. Front view of the Chapman Training Annex entry gate in.