2 sentences

1. 他在越战中服过役。

   tā zài Yuè​zhàn zhōng fú guo yì.

   He served in the Vietnam War.

   Source: Dong Chinese Dictionary

2. 在越战期间，美国曾大力支持南越政府。

   zài Yuè​zhàn qī​jiān, Měi​guó céng dà​lì zhī​chí Nán Yuè zhèng​fǔ.

   During the Vietnam War, the United States strongly supported the South Vietnamese government.

   Source: Dong Chinese Dictionary