The A10 was hard to (FAC) control because, partly, of that canopy. Other jets would tip in, on a fixed heading, and you could generally control them in with relative ease. But the A10 would loiter and sometimes only be seen, fleetingly, above a woodline of tactical crest. So you'd instinctively pick up the visual cues (heading, attitude, bank rate and 'canopy' etc) and give instructions based on where your eyes told your brain the jet was heading (and where the pilot was looking). Invariably, you'd be wrong. If it was hard for us, a terrified GBAD bod running a pulse of 150, in poor biz and trying to calculate aim off in nanoseconds would certainly have their work cut out.