I can tell you that the stryker units are authorized and NBC NCO because I am in one. You don't get your own high speed stryker though and you will be lucky to ride in one. I myself am assigned a FMTV with a driver. The strykers look mean and have M2 and MK19 but they are big pieces of crap. At least the ones in FT. Wainwright are. They break and crap out and can't handle the cold. Just know that you probably wont be going on any patrols with the infantry guys so you will be somwhat safe but most likley you will be traveling in the supply convoys so I guess that cancels any safe feelings you may have. Hmmm, they also tend to leave the NBC guys to do their own thing. Mostly because they feel (and I agree a little) that NBC isn't to big of an issue right now. They do listen to me and they do do training but not enough to keep me occupied. I am the movement NCO also so that makes the job a little crapy but it gives me alot to do.
As for the infantry side of it. It makes it alot easier for travel seeing as how you don't have to hump all the crap in your ruck. but for the drivers and vehicle commanders it is alot of BS they are always running to the civilian mech to fix something and always at the MP screwing with the strykers. Good luck, I am starting to ramble to I will sign off.