SELRES: Selected Reserve. Sailors must affiliate with the SELRES if they have served less than 6 years of Active Duty service. Once a Sailor has completed a combined 6 years of Active Duty and SELRES service, they may be transferred to the Individual Ready Reserve for 2 years for the remainder of their MSO. Responsibilities of a SELRES member include completing the one weekend of drilling per month and two weeks of Annual Training (AT) each anniversary year. A Sailor’s first year in the SELRES will be prorated based on the time of year when affiliation is completed. Some commands may offer alternative drilling options.
IRR: Individual Ready Reserve. The Navy’s IRR is made up of both Sailors who still need to meet their contracted MSO obligation and those who have met MSO requirements but volunteer to serve with IRR status.