RMK-BRJ was an American construction consortium of four of the largest American companies, put together by the United States Navy during the Vietnam War. Its purpose was to build critically needed infrastructure in South Vietnam, so that the Americans could escalate the introduction of American combat troops and materiel into Vietnam. This construction contract, amounting to $1.9 billion, completed a construction program deemed to be the largest in history up to that time. The consortium derived its name from its four constituent companies: Raymond International, Morrison-Knudsen, Brown & Root, and J.A. Jones.

Morrison–Knudsen (MK) was an American civil engineering and construction company, with headquarters in Boise, Idaho.