Under the contract, Lockheed provides cargo packing for delivery to and from the ISS. Cargo consists of pressurized and unpressurized science and logistics carriers, assembly hardware and crew support cargo. Other contract services include verifying the adequate performance of integrated cargo carriers, packing pressurized cargo into sub-carriers and returning the cargo to providers once it returns to Earth. The extension takes effect Oct. 1, 2009, and is the second of two such options provided in the original contract.