48 CFR 632.402: 632.402 General.

(b) Advance payments shall be authorized sparingly. Contracting officers should consider the use of partial payments, fast payments, or more frequent payments as alternatives to advance payments.

(c)(1)(iii) The authority to make the determination prescribed in FAR 32.402(c)(1)(iii) is delegated, without power of redelegation, to the head of the contracting activity (see 601.603-70). For acquisitions by overseas posts, the head of the contracting activity shall obtain the concurrence of the Procurement Executive before making a determination pursuant to this section.