Soldiers of the U.S. Army 23rd chemical battalion wear gas masks while attending a demonstration of their equipment during a ceremony to recognize the battalion's official return to the 2nd Infantry Division based in South Korea at Camp Stanley in Uijeongbu, north of Seoul, Thursday, April 4, 2013. The 23rd chemical battalion left South Korea in 2004 and returned with some 350 soldiers in Jan. 2013. The battalion will provide nuclear, biological and chemical detection, equipment decontamination and consequence management assistance to support U.S. and South Korean military forces. North Korea warned Thursday that its military has been cleared to attack the U.S. using "smaller, lighter and diversified" nuclear weapons, while the U.S. said it will strengthen regional protection by deploying a missile defense system to Guam. AP Photo/Lee Jin-man Tug boats tow the Carnival cruise ship Triumph into the middle of the Mobile River Wednesday April 3, 2013 in Mobile, Ala. The ship broke its moorings Wednesday at BAE Shipyard. Carnival Cruise Lines says a crippled cruise ship that tore loose from the Alabama dock where it's being repaired is secure and has been moved to a terminal. AP Photo/AL.com, Bill Starling In this photo taken on March 18, 2013, patients sit in a sauna room at the Scientology health center of Vietnam Association of Agent Orange Victims in Thai Binh city, Vietnam. The center runs a 25-day health program which, as well as massive consumption of vitamins, includes four-hour sauna sessions and a morning run. While there is no medical evidence that the treatment at the center is effective, Vietnamese authorities are supporting it as a way of relieving some of the suffering of the between 2 and 4 million people suffering from illnesses linked to exposure to Agent Orange during the war. AP Photo/Na Son Nguyen North Korea moved a missile to its east coast after warning it could use "diversified" nuclear weapons. The U.S. deployed an advanced missile defense system to Guam. The bill going to the governor today adds more than 100 firearms to the assault weapons ban and creates a registry for dangerous offenders. Colorado authorities say the men belong to the same white supremacist gang as Evan Ebel, a suspect in the death of the corrections chief. Mike Rice once knocked out of one of his father's teeth while playing basketball and a former assistant said he was "crazed" about the game. As a way to share the sacrifice of federal workers, he's going to return 5 percent of his presidential pay. The Carnival cruise liner that stranded thousands of passengers for days was torn from its moorings by strong winds. Veterans exposed to Agent Orange are trying a 25-day vitamin and sauna regime promoted by the church. Alzheimer's costs up to $215 billion a year to manage, mostly on care to get the afflicted through daily routines. The HTC smartphone being introduced today has new Android technology that deeply integrates the social network. The AP's David Bauder says 62-year-old Jay Leno has been around for a long time, while 38-year-old Fallon is up and coming. NBC also gets to move 'Tonight' back to New York.