Section 217.7404-5 - Exceptions(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.60 FR 29498, June 5, 1995, as amended at 63 FR 67804, Dec. 9, 1998; 71 FR 27643 , May 12, 2006; 84 FR 39206 , Aug. 9, 2019