10 U.S.C. § 3401

1. (1)The term “delivery order contract” means a contract for property—
   1. (A)that does not procure or specify a firm quantity of property (other than a minimum or maximum quantity); and
   2. (B)that provides for the issuance of orders for the delivery of property during the period of the contract.
2. (2)The term “task order contract” means a contract for services—
   1. (A)that does not procure or specify a firm quantity of services (other than a minimum or maximum quantity); and
   2. (B)that provides for the issuance of orders for the performance of tasks during the period of the contract.