Short answer is NO. The PAC-3, PAC-3 MSE and THAAD serve a different role and it would be difficult to replace those roles with a land based SM6. The PAC3/MSE provide a large magazine (12-16 missiles per launcher) to forward deployed troops including protection from saturated TBM attacks. THAAD provides the ability to go after highly capable (IRBM class) TBM threats from longer distances and allows for these threats to be engaged from the exoatmosphere. Assuming that a large booster equipped weapon is acceptable to the US Army, the SM6 may provide a complementary capability to both those systems but would not replace their unique role in Army IAMD.