48 CFR §52.216-21

As prescribed in 16.506(d), insert the following clause: Alternate I (APR 1984). If the requirements contract is for nonpersonal services and related supplies and covers estimated requirements that exceed a specific Government activity's internal capability to produce or perform, substitute the following paragraph (c) for paragraph (c) of the basic clause: Alternate II (APR 1984). If the requirements contract includes subsistence for both Government use and resale in the same Schedule, and similar products may be acquired on a brand-name basis, add the following paragraph (g) to the basic clause: Alternate III (OCT 1995). If the requirements contract involves a partial small business set-aside, substitute the following paragraph (c) for paragraph (c) of the basic clause: Alternate IV (OCT 1995). If the contract includes subsistence for both Government use and resale in the same Schedule and similar products may be acquired on a brand-name basis and the contract also involves a partial small business set-aside, substitute the following paragraph (c) for paragraph (c) of the basic clause and add the following paragraph (g) to the basic clause: