I am an amateur military buff, and the US Navy is a specialty of mine, but I have some knowledge of all the US Armed Forces. I am also a Civil War buff. I am a member of the Coast Defense Study Group (www.cdsg.org), which encompasses all coast defenses but specializes in US fortifications 1885-1945.
As of March 2014 I have edited (to a variable extent) the US destroyer and submarine class pages from the Bainbridge-class destroyers and USS Holland (SS-1) through the Clemson-class destroyers and V-boats. In US battleships I've done some work on the Wyoming, Texas, and Nevada class pages and their ship pages. I've also done most of radar picket and created the Guardian-class radar picket ship page.