Richard,
The Revell kit is the best large-scale AH-64 kit available. It came out in 1987, so it is a little lacking on the detail end of things, but the basic shape is spot-on. The cockpit detail is very good. Basically the kit is missing the cable-cutters, wire strike bracing, ECM antennae and laser detectors that modern AH-64A's have. With some scratchbuilding, it makes a great representation. I'm actually working on an article for FSM right now on updating the Revell kit.
Your son-in-law is probably working with AH-64A's from two different Army National Guard units if he's in-country right now. Drop me an email and I can send you some photosof Marine/Army cooperation in Afghanistan and answer any further questions you may have.