Final answer:
Historically, military personnel could be made ineligible to reenlist based on their sexual orientation, with policies during World War II leading to discharges for such reasons. However, modern policies, such as the repeal of 'Don't Ask, Don't Tell,' have removed sexual orientation as a factor in reenlistment eligibility. Personal circumstances and the reactions of peers and family might also affect the decision to continue with service.
Step-by-step explanation:
Engaging in certain behaviors or having certain characteristics might make individuals ineligible to reenlist in the armed forces. For instance, historical policies regarding sexual orientation in the U.S. military were strict, especially during periods such as World War II, where potential enlistees underwent psychological examinations that included questions about sexual orientation. Although a vast majority were not disqualified for homosexuality, due to concealment strategies, those who were openly homosexual or were discovered could face discharge.
In deciding to turn back from service for personal reasons, military personnel must consider various factors. The reaction from peers, family members, and others plays a substantial role. Moreover, there are oaths and obligations taken by service members that emphasize loyalty and commitment to the Armed Forces and noncombatant or national service as required by law.
However, it is important to note that policies have since changed, and the 'Don't Ask, Don't Tell' policy which previously barred openly gay, lesbian, or bisexual persons from military service was officially repealed in 2011. This means that current criteria for reenlistment eligibility have evolved and no longer disqualify individuals based solely on their sexual orientation.