48 CFR §637.110

1. (a)The contracting officer shall insert the clause at 652.237-70, Compensatory Time Off, in personal services contracts awarded in support of International Narcotics Control programs overseas, if the contracting officer determines its use appropriate.
2. (b)The contracting officer shall insert a clause substantially the same as the clause at 652.237-72, Observance of Legal Holidays and Administrative Leave, in all solicitations and contracts where contractor personnel will be working on-site in any Department of State facility. Overseas contracting activities may add local holidays to the list included in paragraph (a) of the clause.
3. (c)The contracting officer shall insert the provision at 652.237-73, Statement of Qualifications for Preference as a U.S. Person, in all overseas local guard solicitations.