'Support infantry'? Are you referring to the support personnel
in the infantry formation (medics, pioneers, signallers, anti-tank
personnel, etc?)
By the way, I sure hope you don't see those support personnel as
any 'better' or any 'worse' than the common infantryman. We all
have different jobs to do, and different tasks to fulfill. It
doesn't do justice to anyone in the formation if you start
labelling them as 'better' or 'worse'.
I'm an infantry combat medic spec by the way. So you can ask me
about the medics.