That was my thinking .... that they are trying different systems to see how they work. As I said, I saw the two tan colored ones, first while I was on the bus, going downtown (they were right ahead of me- it had a small black number 10 on the left side) and I got a good look at the rear of the second Stryker. Later, about 3/4 of an hour, at Duffern and Richmond St., there was this crowd and a small traffic jam, and right in the middle of it was the first Stryker, stuck in the intersection. The second one was off to the right, in front of Stobbies's Pizza. What a mess. It looked like a turrent from an Panhard or a French AMX type vehicle had been set on top of the Stryker. It filled the whole space from side to side, with the barrel just hanging over the front. The second time, about 10 days ago, was a different configured one, in semi-gloss green, with a smallish turrent set slight back from the center of the vehicle. It had the Bradley rear top hatch, with the left side, covered with obvious tool holders. Man, these things are QUIET! If I had not seen the second Stryker coming down Warncliffe Rd., North, I would not have seen or heard it. Sounds no louder than city bus at idle. The turrent looked smallish (think of the turrent in the Academy M113 Gattling gun kit) and was narrower at the top with a rear-ward opening hatch. All I had was 30 seconds and the thing was gone in traffic.
Yes, the military in Iraq needs more than standard Humvee's. The troopers need to protect themselves from fire from all sides, and if you do a look see on "Community Webshots" of the 1/2 inch cold rolled steel "up-armored" Humvee's that the military is using, they deffinitly need the Strykers real bad.
Of course, they have lots of old M113's around, and as a short term solution to the problem. That too would make a interesting modeling subject, an up-armored M113, with the proposed RPG shields!