Analysis - Shootings frustrate U.S. military efforts to secure bases

(Reuters) - The latest shooting at Fort Hood is throwing a spotlight on the U.S. military's so-far frustrated efforts to secure its bases from potential shooters, who increasingly appear to see the facilities as attractive targets.

A soldier with mental health problems killed three people and injured 16 at Fort Hood in Texas, going from one building to another to open fire with a semi-automatic handgun before taking his own life, the military said.