accuracy international arctic warfare northern fleet 1968 thule air base b-52 crash project iceworm north russia intervention cold-weather warfare arctic naval operations of world war i i operation zitronella maritime forces atlantic basis nord operation fritham u s s o-12 ( s s-73) i c e x: u s navy mission in arctic " a" device operation nanook operation nanook (1946) operation gearbox
Military_Military by continent