(a) The limitations in 243.204-70 -2, 243.204-70 -3, and 243.204-70 -4 do not apply to unpriced change orders for the purchase of initial spares.

(b) The limitations in 243.204-70 -4(a) do not apply to unpriced change orders for ship construction and ship repair.

(c) The head of the agency may waive the limitations in 243.204-70 -2, 243.204-70 -3, and 243.204-70 -4 for unpriced change orders 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.