make contracts for services and supplies without regard to the provisions of section 6101 of title 41, when the aggregate amount involved is less than $300;

enter into subordination, subrogation, or other agreements satisfactory to the Secretary;

compromise, adjust, reduce, or charge-off claims, and adjust, modify, subordinate, or release the terms of security instruments, leases, contracts, and agreements entered into or administered by the Secretary under this subchapter, as circumstances may require, including the release of borrowers or others obligated on a debt from personal liability with or without payment of any consideration at the time of the compromise, adjustment, reduction, or charge-off of any claim;