My understanding was that everything went to military intelligence first - or was supposed to - so that they could do their investigations and the like. After that, some was kept for historical purposes and then what wasn't wanted (or needed) went to the US MAAG. That meant some/all supposedly went to the SVN military, and some went to MAAG (MACV, 5SFG, etc.) programmes in country or - shall we say - 'places the US military wasn't'.