>> If any order is issued under a Federal Government contract or higher-tier subcontract, the following Federal Acquisition Regulations ("FAR") are hereby incorporated.
I suppose the govt is issuing the order(s), not the other way around.
I think that people who've commented already had good comments.
I agree with: "Federal Government contractと同等もしくは、それ以上の効力を有する"
Fed.Govt. (agency) orders to [high-level entity], which subcontracts the order to a company.
and FAR applies to the subcontract.