With four rockets included with the default loadout, the US AT rocket is a viable tool for long range sniping enemy spawns. The bazooka model is pretty bare, so reference points for holdover are quite subtle, but they are there and can be counted on for accurate ranging!
Simply ping the center or base of the desired target, line the ping up with your reference point for that range (while zoomed**) and fire away.
See the montage below to watch the technique in action, as well as the testing done to figure out the ranges:
Great work, man. This is awesome.