Defense Secretary Chuck Hagel said on Wednesday the United States had always supported a strong nuclear deterrent and would continue to do so, even as it braces for a nuclear forces overhaul. "To modernize your nuclear weapons stockpile and assure that they continue to stay secure and safe, it takes money, it takes resources," Hagel said after touring Sandia National Laboratories and Kirtland Air Force Base, two facilities involved in maintaining the weapons. The U.S. defense chief said upgrading U.S. nuclear warheads and the submarines, bombers and missiles that deliver them would require setting priorities and minding the budget, but he added the country "has always been willing to make that investment and I think it will continue to make it."