remember, block IIA has flight ceiling of 1000km.
And i am gonna say this is a late midcourse interception.
and only thing has similar capability to SM 3 is arrow 3 at that moment
And yes, GBI is a class of its own.
Nice chart on where everything falls in the US terminology as of 2017:
can you explain doctrinal logic behind AD 2 type capability ? because it seems to me, at the it will become operational, HGVs will take over the role of MRBMs.
HGVs are too shaky at the moment as a definitive system on which deterrence can be built. They are in the same league as Railguns which everyone thought would be the future and that fizzled out because they are too complicated to be reliable.
Just like SM-3 isn't going anywhere for a long time (there will undoubtedly be future Blocks), this class of interceptor has a long future.
Even with HGVs, the future developments will focus on changing up the type of Kill Vehicle loaded on these ABMs (taking cues from existing Midcourse & ASAT developments) to include likes of maneuverable or multi-object KKVs. The booster & missile itself will still be needed to get the KKV where it needs to go.