I specialize in US coastal fortifications and the US Navy, but I have some knowledge of all the US Armed Forces. I have been editing Wikipedia since August 2013, with significant contributions to over 120 articles. These include 44 articles on individual forts and 23 articles on US coast defense weapons. I am an American Civil War buff, but have relatively few references for this. I am a member of the Coast Defense Study Group and have "American Seacoast Defenses: A Reference Guide", along with other books on US forts. I have a scanned file of the gun and carriage cards for the 4.72" Armstrong guns and will be editing related pages.