text: Well, as informative as the Wikipedia is (to the non-initiated), to ANSWER your question, Captain America proper was not assigned to any specific unit; he was a freelance operative, more akin to an OSS officer, as he pretty much was sent where he was most needed as events warrented, though he often tried to help out any "common joes" he might meet along the course of his movements. And though given the rank of "Captain," he pretty much only took orders from the President and top-level brass, so the idea of our favorite shield-slinger "falling in" to formation every morning with a commun unit and being checked to see if he shaved and shined his boots is a little...silly.