WASHINGTON, (Reuters) – Decorated Vietnam veteran Chuck Hagel was sworn in as U.S. defense secretary yesterday after a bruising Senate confirmation battle, promising to renew old U.S. alliances and forge new ones without attempting to “dictate” to the world. Addressing Pentagon employees shortly after a small, closed-door swearing-in ceremony, Hagel spoke optimistically, if vaguely, about global challenges ahead and the importance of American leadership abroad. “We can’t dictate to the world. But we must engage the world. We must lead with our allies,” Hagel said in what appeared to be unscripted remarks.