I can.
I should probably just specify the previous points because I don't want there to be a misunderstanding. Some of the senior members of ISIL are former Baath Party Iraqi senior officers who at the end of the Second Gulf War would have been no longer employed in the Iraqi military as part of the de-Baathification. So while they have the experience it's not like they were in the Iraqi security forces yesterday and walked across.
Some of the equipment that ISIL has they brought with them from Syria, so there's some former Syrian equipment. In overrunning certain positions they do have some Iraqi equipment, which is of U.S. origin. But the technical expertise to maintain them at that level...you're starting to see those slowly degrade as well as the fact of coalition air strikes degrading that. There's a wide range of equipment that you would have seen from tanks to artillery weapons. There are also technical vehicles, which would just be a typical pickup truck with a heavy weapon in the back. There is a wide range of source material in that case.