Easy there guys no need to rage over the EZ8.
On the topic of the 50.cal, it just makes sense to me more over the M19 rack unlocks because of the Rack unlock changes rifle play to be medium range and very static. Having the 50 would not only let you skip over LT but also let the Rifles keep mobile with Bars with good support. There's also a lack of active abilities in the doctrine Imo and having the LMG rack or the rifle defenses would be just more fun than more passives.
Half-track seems like a good idea thou, rifles always needed halftracks to move. Now it's just the question of the M3 or the M5. :0
It's either medical bags or AI/AA capabilities in the form of the M16 really, I don't know how much they differ in stats exactly altho the M5 is a bit bulkier and should logically have a tad more HP, and maybe be a bit slower but I'm not 100% sure.