Close Combat - back to front

[arnej]

Thinking waaay back to my aikido days, it was not uncommon to end up in a grapple where the foe's back was facing my front.

Looking at the benefits grappling from the rear grant, esp. regarding a choke hold:

Is there a maneuver/technique/whatever to let you get behind your foe in a close combat? I've not been able to find one in Basic or Martial Arts. Maybe in Tech Grappling?

Thanks,

arnej