Sa (Japanese: 佐; Korean: 좌; Hanja: 佐; RR: jwa; Vietnamese: tá) is the rank held by field-grade officers in the militaries of Japan, Vietnam, and North Korea.
The only difference between rank names are the use of morphemes, which are riku (Japanese: 陸, lit.
'land'), kai (Japanese: 海, lit.
'sea') or kū (Japanese: 空, lit. 'air').
[1]