History: A U.S.Navy river patrol boat (PBR) crewman maintains vigilance at the .50-caliber machine gun during the boat's day-long patrol on the Go Cong River, January, 1967. (Colorized) [1873 × 1403]

https://i.redd.it/s5ndb6g61hs01.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/8cwj3s/a_usnavy_river_patrol_boat_pbr_crewman_maintains/?utm_source=ifttt