Government project overseas. All subcontractor and sub-subcontractor work performed in the USA. GC paid subcontractor for all of sub-subcontractor's work and finished materials. Subcontractor refuses to pay sub-subcontractor. Sub-subcontractor makes Miller Act claim notice. GC responds that no bond was issued or required -- asserts requirement waived under overseas project exception of 40 U.S.C. 3131(d). What recourse does the sub-subcontractor have? Obviously, no lien could be obtained on government contract. Can sub-subcontractor pursue claim against GC for failure to obtain bond, if the exception was not proper?