In the interest of public safety, massive stockpiles of munitions and warfare vehicles, cease and desist all purchases and immediately turn over said provisions to the Armed forces, and local municipalities law enforcement. Never in our history have we needed a "domestic" army. We have the National Guard for that.
In the words of Governor Cuomo, "NO ONE NEEDS 1.6 BILLION ROUNDS TO DEFEND THEMSELVES!!!!"
If you want the DHS to do something useful have them secure the borders.