敬礼

1. Origins, structure, and basic meaning

• Structure: 敬礼 (けいれい) is an action noun for a formal gesture of respect that combines with する.
• Basic usage: 隊長に敬礼した marks the recipient of the salute with に, while 一斉に敬礼する adds 一斉に to describe members performing it simultaneously.

2. Common pitfalls and similar expressions

• Two different functions of に
  • In 隊長に, に marks the person saluted; in 一斉に, に forms a manner adverb. Their identical surface particle does not give them the same syntactic role.