This memorandum sets out information and analysis concerning presidential references in official notifications and records to the Authorization for Use of Military Force (2001 AUMF; Public Law 107-40; 50 U.S.C. § 1541 note), enacted in response to the September 11, 2001 terrorist attacks on the United States. It contains very brief discussions of the relevant provisions of the 2001 AUMF, and the uses of U.S. armed forces connected with 2001 AUMF authority, as well as excerpted language and other information from the notifications.