The Engineer's "support" career path contains a bit more esoteric batch of equipment: a handheld explosives defuser, enhanced NetBat ID computer and a plantable vehicle detector. This branch of the career tree is capped off by a powerful anti-armor rifle - but more on this later.
Your first unlock in this path, the AE Defuser, is handy in theory, but by the time you realize you need it, it's usually too late. Unlocks must be achieved in order, so you'll just have to swallow this one if you want the next few.
Finally, the PDS-1 tracker unlock (the last before the Koenig H-AVR Heavy Anti-Vehicle Rifle), is a droppable UAV-like device that tracks enemy vehicles. This is quite useful if you are shuttling between two strategic points and need to keep an eye out for vehicles - but we'd suggest that if you are going to spend the time to drop something, it might as well be mines.
