The Pentagon Has Selected 2013's Most Intense Military Training Photos

It all starts with boot camp, which is designed to drill in the military mindset from the get go.

By applying various degrees of physical and mental stress, the six to twelve weeks of "hell" weeds out the weak and makes sure you know what to expect in military service.

Boot camp isn't even the end of the difficulties. It's only a warm-up. Over 40 % of soldiers who enlist never make it through the first four years.

Training programs are designed to destroy the civilian attitude and put together an obedient, loyal, and disciplined member of the armed forces.

The Department of Defense recently released their top 2013 photos from military training. We've collected the best ones here.