This is a firm-fixed price, indefinite delivery contract for a power unit envelope, with a quantity of 1,639 units. The contract has a three-year base period with two potential one-year options, for a potential total performance period of five years. Inspection, acceptance, and FOB terms are at the origin, with first destination transportation applying. Quotes will be evaluated for best value based on price, past performance, and delivery, with non-price factors combined being equal to price. The business size standard for this unrestricted, full and open competition is 1,250 employees.