我的哥哥是一名美国海军陆战队员，他在海外服役了两年。

My brother is a ___U.S. Marine who served overseas for two years.

技术员使用超声波检测来检查焊缝质量。

The technician applied ___USM to inspect the weld quality.

他去年从南密西西比大学获得了心理学学位。

He received his psychology degree from ___USM last year.