They were found on an old destroyed Iraqi airbase in Al Kut. The US had taken over that base and were stationed there. These documents were found in a safe in a building on the base. I guess that all the Iraqi's paperwork and everything was scattered all over the place and there were a lot of these cards mixed up in the mess of documents. I have 6 purple, 4 pink, and 2 peach ones. I have no idea what the difference in color means but they are all marked generally the same.