http://www.fayobserver.com/article?id=311008

His crimes:

http://en.wikipedia.org/wiki/Ronald_A._Gray

One thing unique to military executions:

President Bush on July 28, 2008, approved the death sentence in the case of the United States v Ronald A. Gray. The Uniform Code of Military Justice specifies that only the president can give final approval to a military death sentence, Army officials said.

Chicago Tribune Article:

http://www.chicagotribune.com/news/nationworld/chi-ronald-a-gray-080729-ht,0,1444216.story

Bush's decision marked the first time in 51 years that a president has affirmed a death sentence for a member of the U.S. military. It was the first time in 46 years that such a decision has even been weighed in the Oval Office.

This article is concerning:

http://english.pravda.ru/world/americas/29-07-2008/105914-bush_ronald_gray-0

The history of the US Army knows many incidents when courts martial brought down death sentences against military men. This was especially noticeable during the US-led campaign in Iraq. There was quite a number of incidents, when US military men were put on trial for their actions against Iraqi civilians. US peacemakers raped women and children, humiliated and tortured unarmed men.