Contracting officers at domestic contracting activities may use an economic price adjustment clause based on cost indexes of labor or material in accordance with the circumstances listed in FAR 16.203-4(d) and after obtaining the approval of the head of the contracting activity. Overseas posts may use the clause at 652.216-71, Price Adjustment, when procuring continuing services (e.g., guard, janitorial, building maintenance, and gardening). Posts shall obtain A/OPE approval for any price adjustment clause that differs from the clause at 652.216-71.