Unlike the enlisted joining process, becoming a military officer requires extra training, education or expertise. In exchange for the increased responsibility. Leadership, training and team work are just three reasons why British Army officers are the best in the world. Find out more about how you could join. Join the Military. Compare Ways To Become An Officer. movingi-10forward.com military officers. The training lasts up to 20 weeks culminating in commission as officers. How to Become an Officer in the Military. The rank of officer in the U.S. military consists of commissioned officers and warrant officers. Commissioned officers. There are four ways to join the Air Force as an officer. While each way differs Attend Officer Training School after earning college or postgraduate degree. Interested in becoming a military officer? (ODS) or the Direct Commission Officer Indoctrination Course (DCOIC), depending on which Service they join. Officer Candidate School · Service Academies · ROTC.