public work
(1) the term “public work” means any fixed improvement or any project, whether or not fixed, involving construction, alteration, removal or repair for the public use of the United States or its allies, including but not limited to projects or operations under service contracts and projects in connection with the national defense or with war activities, dredging, harbor improvements, dams, roadways, and housing, as well as preparatory and ancillary work in connection therewith at the site or on the project;