Crossword clues for usm usm P.O. abbr Magnolia St. campus Lance cpl.'s org Lance corporal's org Sch. north of Gulfport Leathernecks, initially Lance cpl.'s grp Gyrene initials Gen. Shepherd’s outfit Armed Forces branch: Abbr Abbreviation on a skivvy Mil. branch Lance cpl.'s grp. Lance cpl.'s org. Sch. near Gulfport G.P.O. items P.O. abbr. Leathernecks' outfit: Abbr. Service branch: Abbr Leathernecks' org Postal initials Branch of the mil Wikipedia USM USM may stand for: