Which entity is likely to be the target company (on a share sale) or the seller (on an asset sale)? The official website of the U.S. Air Force.If you're planning a buyout, getting a buyout agreement in place is essential. But how do they work exactly? In PPA contracts, sellers and buyers define the terms and conditions of the energy supply, often for a 10- to 20-year term. (1) The defense acquisition system, as defined in 10 U.S.C 2545, exists to manage the investments of the United States. Justification documents are provided in the books as listed below.