The Arms Export Control Act (AECA) authorizes the President to control the import and export of defense articles and services in furtherance of world peace and the security and foreign policy of the United States. Pursuant to delegated authorities, the Secretary of State is authorized to make decisions on whether license applications or other written requests for approval shall be granted, or whether exemptions may be used. The Secretary of State is also authorized to revoke, suspend, or amend licenses or other written approvals whenever such action is deemed to be advisable. The administration of the AECA is a foreign affairs function encompassed within the meaning of the military and foreign affairs exclusion of the Administrative Procedure Act and is thereby expressly exempt from various provisions of that Act. Because the exercising of the foreign affairs function, including the decisions required to implement the AECA, is highly discretionary, it is excluded from review under the Administrative Procedure Act.