sentences:  It would be one of 77 such bridges that the Brigade would construct in the country.In support of the XXIV Corps, the 18th Brigade mounted what was described as the "most ambitious engineering effort in Vietnam" at the end of January 1971.The Brigade engineers pushed a roadway across the rugged terrain of the northern Quảng Trị Province to the Laotian border and constructed a by airfield in little more than a month at Khe Sanh.