The Ghar aren't generally known for their bravery. As such, trying to get a bunch of them to run into unknown territory and find out what the enemy have in store is kinda rough. Thankfully, there's a particular breed of Ghar that doesn't seem to mind. ... It's probably due to hanging around plasma reactors too much.
These Ghar are armed with Tectors. What's a Tector? It's a detecting device that specifically lets friendly Ghar re-roll attacks if they're within 15" of each-other. Considering that can greatly increase your total number of hits, it's a certainly handy thing to have around.