Section 251.102 - Authorization to use Government supply sources(e) When authorizing contractor use of Government supply sources, follow the procedures at PGI 251.102.(3)(ii) The contracting officer may also authorize the contractor to use the DD Form 1155 when requisitioning from the Department of Veterans Affairs.(f) The authorizing agency is also responsible for promptly considering requests of the DoD supply source for authority to refuse to honor requisitions from a contractor that is indebted to DoD and has failed to pay proper invoices in a timely manner.69 FR 67858, Nov. 22, 2004