CREATE TABLE table_10193 ("Name" TEXT, "Service" TEXT, "Rank" TEXT, "Place of action" TEXT, "Unit" TEXT)

Name the service for 7th marines rank of sergeant
SELECT "Service" FROM table_10193 WHERE "Unit" = '7th marines' AND "Rank" = 'sergeant'
SELECT "Service" FROM "table_10193" WHERE "Rank" = 'sergeant' AND "Unit" = '7th marines'