Yep, that's a 3rd ACR bird. There's another shot of her on AKO today. Wish I'd had those shots when I was doing the book!
She's from Renegade Troop, one of the 3rd ACR's three Apache Troops (companies). I'm trying to get a tail number for this bird, but haven't found one yet. She's an AH-64D (DWO) so she never had a Longbow Radar.
Interesting note on the weapons loadout. She's carrying two full rocket pods, with the center 3 rockets being "nails"; only carrying a single Hellfire for engaging vehicles or buildings; and most likely has a full cannon magazine. The "nails" are antipersonnel rockets that contain 2200 steel flechettes (basically an inch and a half long nail with fins on the end) that saturate a football field-sized area with high speed steel darts. Really nasty if you're on the receiving end of it. If that's not optimized for Counter Insurgency, I don't know what is!
Here's another shot of it!