48 CFR §42.1305

1. (a)The contracting officer shall insert the clause at 52.242-14, Suspension of Work, in solicitations and contracts when a fixed-price construction or architect-engineer contract is contemplated.
2. (b)
   1. (1)The contracting officer may, when contracting by negotiation, insert the clause at 52.242-15, Stop-Work Order, in solicitations and contracts for supplies, services, or research and development.
   2. (2)If a cost-reimbursement contract is contemplated, the contracting officer shall use the clause with its Alternate I.
3. (c)The contracting officer shall insert the clause at 52.242-17, Government Delay of Work, in solicitations and contracts when a fixed-price contract is contemplated for supplies other than commercial or modified-commercial products. The clause use is optional when a fixed-price contract is contemplated for services, or for supplies that are commercial or modified-commercial products.