The United States Congress is considering a proposal that will affect the construction cost and labour make-up of the millitary build-up in Guam.
By 2014, 8,000 marines and their families are to be transferred from Okinawa in Japan to Guam following a deal signed by the U.S and Japan in February.
The national defence authorisation bill proposes that construction workers be paid double the islands' current wages in line with wages on Hawaii.
It also proposes to restrict foreign labour to 30 percent.
If the bill passes in its current form, it will raise the cost of the military construction projects to 934 million US dollars.