Assertion: corps's officer | /r/HasProperty | black jackpershing
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text: Before World War I ended in November 1918, over half of all Coast and Geodetic Survey Corps officers had served in the U.S. Army, U.S. Navy, or United States Marine Corps, performing duty as artillery orienteering officers, as minelaying officers in the North Sea (where they were involved in the laying of the North Sea Mine Barrage), as navigators aboard troop transports, as intelligence officers, and as officers on the staff of American Expeditionary Force commanding officer General John "Black Jack" Pershing.