48 CFR 32.106 - Order of preference.
The contracting officer must consider the following order of preference when a contractor requests contract financing, unless an exception would be in the Government's best interest in a specific case:
(a) Private financing without Government guarantee. It is not intended, however, that the contracting officer require the contractor to obtain private financing -
(1) At unreasonable terms; or
(2) From other agencies.
(c) Loan guarantees.
(e) Advance payments (see exceptions in 32.402(b)).