The JLTV hasn’t been fielded yet. The program is in the EMD stage of testing. The MATV mad by Oshkosh looks alot like what the JLTV will. I used to work on the JLTV program for BAE Systems. Our version didn’t make the cut after the TD pase of testing. You are correct about the HEMMT. The Marine Corps calls them LVSs. I was a 3521 Motor Transport Mech in my younger days as a Marine.
I’m pretty sure Oshkosh won the contract. The JLTV may not be fielded yet, but there are a bunch of them, of two different varieties, on that train. I recognize the big “cage” structure on the back end, and the shape of the windows on the side doors. The rear passenger doors of the Oshkosh truck have a really distinctive very tiny window. There are two different “noses” on the vehicles on that train, so they may be testing a couple of different versions of the Oshkosh truck.
Oshkosh’s own webpage shows at least three different noses for the JLTV, a high-nose, a medium-nose with really high fender arches, and a low-nose with the headlights almost at axle level, as well as an air-droppable version that looks completely different from everything.
I only know this because I really like the look of the “high-nose” version of Oshkosh’s truck, and would love one day to get my hands on one, even if it didn’t have the armored body. It reminds me of the old ‘70s GM truck line.