Note: Do not capture personally or come close to the ship personally (in sector). Ship is in the dangerous region and hull will quickly reach 0 and explode. After discovering the ship location remotely, send the ship with one rookie marine to capture, promote to captain and take it out of the dangerous region.
Just RE the Drill Vanguard, for me it was *right* on the edge of a radiation zone. With enough of a runup and a decently heavy ship you may be able to just launch a ship at it from the other side with enough speed that you can knock it out of the region enough to claim it without taking a lot of hull damage. I managed to knock it clear and claim it personally with only having to repair the fighter.