What negative effect would disbanding the US military structure have?

My husband is in the military, so I back him and his brothers-in-arms 110%. Understand that these military personnel have families to support and cutting them off would obviously cut off their families. Granted, civilians make more than military personnel so why stay in, but these are brave men and women who are ready to answer the call to duty. Besides, as soon as we disband our military we, as a country, are left open and vulnerable to any number of attacks.