Maj. Sean Herlihy, a special projects officer with Marine Corps Individual Reserve Support Activity, Force Headquarters Group, Marine Forces Reserve, speaks with Marines in the Individual Ready Reserve (IRR) during a reserve opportunity and obligations brief as a part of an IRR Muster, Manhattan Beach, California, Jan. 21, 2023. The Marines of the IRR previously served on active duty or as drilling reservists, and now stand ready to augment the active forces in times of war or other contingency. These Marines bring tremendous experience and capability to the United States Marine Corps and are an important part of the total force. (U.S. Marine Corps photo by Cpl. Jonathan L. Gonzalez)