Fort Huachuca, the nation's largest intelligence-training center, changed security measures in May after being warned that Islamist terrorists, with the aid of Mexican drug cartels, were planning an attack on the facility. Fort officials changed security measures after sources warned that possibly 60 Afghan and Iraqi terrorists were to be smuggled into the U.S. through underground tunnels with high-powered weapons to attack the Arizona Army base, according to multiple confidential law enforcement documents obtained by The Washington Times. "A portion of the operatives were in the United States, with the remainder not yet in the United States," according to one...