HAC meaning in Military and Defence ?

The United States House Committee on Appropriations is a committee of the United States House of Representatives that is responsible for passing appropriation bills along with its Senate counterpart. The bills passed by the Appropriations Committee regulate expenditures of money by the government of the United States. As such, it is one of the most powerful of the committees, and its members are seen as influential. They make the key decisions about the work of their committees—when their committees meet, which bills they will consider, and for how long.