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<p>This is not the way things work for officers. Even though they have a set commitment, they serve at the mercy of the President and must submit a letter of resignation in order to leave active duty. During their period of service, they will be up for orders to change duty assignments. Often, the acceptance of these orders is contingent upon remaining active duty throughtout the period required to carry out these orders. Example: After four years, the initial tour of duty is up. Acceptance of the subsequent set of orders will require an agreement to remain on active duty for another three years. If this occured, the only way to get out after the 5 yr initial commitment, would be to refuse the follow-on assignment. Officers do not ReENLIST.</p>