Section 628.309-70 - DOSAR provisions and clauses(a) The contracting officer shall insert the provision at 652.228-70, Defense Base Act-Covered Contractor Employees, in all solicitations for services and construction to be performed outside of the United States.(b) The contracting officer shall insert the clause at 652.228-71, Workers' Compensation Insurance (Defense Base Act)-Services, in solicitations and contracts for services to be performed outside of the United States when there is a reasonable expectation that offers will include covered contractor employees, as defined in 628.305(b). If the contracting officer is unsure as to whether offers will include covered contractor employees, the contracting officer shall insert the clause. 71 FR 34840 , June 16, 2006, as amended at 80 FR 6922 , Feb. 9, 2015