Poking around the the US Army FOIA Electronic Reading Room. Great resource for researchers provided information has been released by FOIA.
US Army FOIA Electronic Reading Room
Among available documents is the Army Regulation AR-15-6 Informal Investigation Report for the abduction of two troops in Iraq. An AR-15-6 is a fact-finding investigation first undertaken when someone is reported missing. At least, that's the way it is supposed to work.
Memorandum for Record pertaining to Army Regulation 15-6 Investigation regarding PFC Thomas L. Tucker and PFC Kristian Menchaca June 18, 2006
Investigation into the 16195JUN06 attach on B/1-502 IN/2-101 AA, resulting in the death of one Soldier and duty status whereabouts unknown (DUSTWUN) of PFC Thomas L. Tucker and PFC Kristian MenchacaI wonder if it is possible to file an FOIA for the AR-15-6 for each and every American who has gone missing in Iraq.
Memorandum - Subject: Army Directive 2010-02
(Guidance for Reporting Requirements and Redacting Investigation Reports of Deaths and Fatalities)
John McHugh, Secretary of the Army, March 26, 2010
DD Form 2812
Commander's Preliminary Assessment and Recommendation Regarding Missing Person