(a) The limitations in 217.7404-2, 217.7404-3, and 217.7404-4 do not apply to UCAs for the purchase of initial spares.

(b) The head of an agency may waive the limitations in 217.7404(a), 217.7404-2, 217.7404-3, and 217.7404-4 for UCAs if the head of the agency determines that the waiver is necessary to support -

(1) A contingency operation; or

(2) A humanitarian or peacekeeping operation.