A U.S. serviceman is in custody after he allegedly admitted he was planning an attack on the U.S. Army base at Fort Hood, Texas, the same base where 13 people were killed in a 2009 terror attack. U.S. officials told ABC News an AWOL serviceman, identified by the FBI as a Private First Class Naser Jason Abdo, was arrested Wednesday after making a purchase at Guns Galore in Killeen, Texas, the same ammunition store where Maj. Nidal Hasan purchased the weapons he allegedly used to gun down 13 people and wound 32 others on Nov. 5, 2009. Abdo, 21, allegedly...