Items or groups of items of articles or services may be purchased independently by executive agencies, in accordance with regulations of GSA otherwise applicable, when:

(a) Not otherwise prescribed in current regulations, or included in mandatory Federal Supply Schedules, issued by GSA or by another executive agency designated by the Administrator of General Services.

(b) For emergency requirements when time does not permit purchasing through the authorized central purchasing agency. A record shall be maintained of such transactions and be made available to the responsible central purchasing agency upon request.

(c) By consultation between GSA and agencies concerned, it is determined that interagency purchase assignment would adversely affect the national security or military operations.

(d) The purchases cannot be publicly disclosed in the interest of national security.