to join the armed forces again, or to sign to stay in the armed forces

He tried to re-enlist in the Marines but was rejected. 他试图重新加入海军陆战队，但被拒绝了。

After you've completed your active duty time, you can either extend your contract or re-enlist if you want to continue serving. 完成现役时间后，如果你想继续服役，可以延长合同或重新入伍。