WASHINGTON - While asserting that Washington was comfortable with Pakistan's security measures for its nuclear weapons, a Pentagon spokesman has hinted that U.S. was prepared to take action in case the situation worsened. Responding to a question at a news briefing whether U.S. Special Operations forces have a contingency plan for securing those arms, spokesman Geoff Morrell said that they are "comfortable with the protocols the Pakistani military has in place to ensure the security of their nuclear arsenal." But he added, "I am sure that our planners take whatever requisite action is required to ensure the arsenal in a country that is obviously in the midst of a great deal -- that finds itself with a great deal of challenges right now, that they have some visibility on where such weapons are located... "The last thing we want is to have the Taliban have access to the nuclear weapons in Pakistan. We're fighting, obviously, that potential in Iran. The last thing we would want is to give Al Qaeda that potential. So we continue to watch that very closely."