Final answer:
SGLI beneficiaries are typically reviewed annually, upon marriage, and upon divorce, but not upon promotion. It's important to keep this information current to reflect the servicemember's wishes regarding benefit allocations.
Step-by-step explanation:
The correct answer is: c) Upon promotion. Servicemember's Group Life Insurance (SGLI) beneficiaries should be verified at several key life events to ensure that the coverage is up-to-date. However, a promotion within the service is not typically a time when SGLI beneficiaries would need to be reviewed or updated. Verification of beneficiaries is commonly done annually, upon marriage, and upon divorce. These life events can significantly affect a servicemember's desired allocation of benefits, hence the need for verification during these times.