Table: medal_of_honor_recipients
Columns: name
service
rank
place_of_action
unit

Question: Tell me the place of action for sergeant rank and 5th company, 2nd marines unit
SQL: SELECT "place_of_action" FROM medal_of_honor_recipients WHERE "rank" = 'sergeant' AND "unit" = '5th company, 2nd marines'

Question: Name the service for 7th marines rank of sergeant
SQL: SELECT "service" FROM medal_of_honor_recipients WHERE "unit" = '7th marines' AND "rank" = 'sergeant'