It's 4.30pm on a quiet backstreet of Killeen, Texas. Above the hum of rush-hour traffic you can hear a solitary bugle playing Retreat from a nearby army base.
It’s something that happens at the same time every day in this town, home to 40,000 soldiers. Fort Hood is one of the largest military posts in the world, with more of its troops deployed to Iraq and Afghanistan than any other in the United States. The bugle, which blares from speakers positioned all over this vast complex, coincides with the US flag being slowly lowered, signalling the end of the day. For some, that sound can’t come fast enough.