There are always strings attached. It part of the Defense Federal Acquisition Regulation. By law there are clauses related to worker healthcare, public transportation encouragement, etc. And this by law part of (every?) government contract: https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FFederal_Acquisition_Regulation and you can view the clauses here https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fwww.acquisition.gov%2Fdfars