Article 1, Section 8, IIRC, allows Congress to Declare War, and issue Letters of Marque...
Our dear Marque Captain, and his band of gentleman adventurers, would find service to these United States to be of little profit or honor if allowed only to defend themselves.
Arms mean weapons. All weapons.
Of course. Congressman Ron Paul introduced the "September 11 Marque and Reprisal Act of 2001"
SEC. 3. AUTHORITY OF PRESIDENT.They are not limited to "personal" arms.(a) The President of the United States is authorized and requested to commission, under officially issued letters of marque and reprisal, so many of privately armed and equipped persons and entities as, in his judgment, the service may require ...