FAR 22.402(b), "Nonconstruction contracts involving some construction work," provides the answer. The contracting officer needs to review paras. (1) and (2) under that section to determine which situation applies to your Base Operations contract. If (1) applies, then Wage Rate Requirements (Construction) apply. If (2) applies, then the clause does not apply. 

P.S. Please note that the term "Davis-Bacon Act "is no longer applicable.