So far we have seen orbital bombardment satellites, ship based rail-guns, shoulder fired tactical nukes, and their Constantine super heavy tanks. Those massive fusion and plasma cannons could probably melt through a large hill pretty quick all by themselves.
You forgot to mention the lovechild of a Hind and a V-22 Osprey, that they have in the thousands. And that each contain a squad of power armoured soldiers. Vertibirds are
scary even to an RL first world military and it's no wonder the NCR gaining access to them is one of the real things that made them an actual decent military.
Of course, E-USA has come up with ways to make them scarier.
BTW:
B-120 Dragon II
The B-90 Dragon was perhaps the most celebrated bomber of Augustus Autumn's presidency. Developed shortly after the recovery of pre-War aircraft factories on the outskirts of Chicago, they proved a devastating force even when equipped with crude WW2-era gravity bombs. But, they were defective in several ways. The plasma engines which gave them their great speed required heavy maintenance, and as a result they often spent more time in hangars than flying - even during the annual Fourth of July parade, they were a rare sight. And worse, simulations demonstrated that their celebrated speed was ineffective against a combination of SAM and laser-based AA defences - which satellite intelligence demonstrated the NCR had built with surprising speed.
So during the Castiglione Administration a bidding war began for a new strategic bomber. The contract was awarded to US Aviation, a company renowned for its flying-wing designs, and it's no surprise that their design followed that pattern.
The core of the B-120 is a diamond shape which contains the bomb bay, cockpit, and avionics. From there two relatively thin swept wings project outwards. The plane is propelled by two direct-air-cycle fusion engines, similar to the F-97 Aurora, capable of flying at Mach 1.5. The bomb bay is capable of containing 40,000 pounds of material, including nuclear arms - it is also capable of containing a modified "Lightning Strike" cruise missile, giving the plane the capability of striking targets from beyond visual range.
The B-120 was designed and built at secret facilities in the Greenland Territory - though the FBI Counter-intelligence Division, based at the Panopticon Building, has claimed there was never any risk of NCR intelligence discovering the project, US Military Intelligence has always cast doubts on such claims.
The B-120's design and advanced composite materials give it a high degree of radar stealth capabilities. Following satisfactory tests over Greenland, a squadron of SAC pilots are to test it in real-world combat conditions over Texas ...