175 bn to be completed in 3 years is a very tall order and sounds like a Trump vanity project but the programs that come out of this are going to be revolutionary.
GD is a systems of systems architecture requiring many novel technologies: sensors, data links, C4I, micro nuclear reactors, to name a few.
I'm particularly interested in the space layer: FOBS KKV (Starshield-like kill vehicles) and seems to be the two big ones; see this comment: