Death Sentence For Akbar

I must have missed the full significance of this the first time around. I vaguely remember hearing something about a soldier killing his comrades. Well, the jury just gave Sgt. Hasan Akbar the death penalty. It will be automatically appealed. Akbar claimed in his apology,

I want to apologize for the attack that occurred. I felt that my life was in jeopardy, and I had no other options. I also want to ask you for forgiveness

The scariest thing is what the prosecution is claiming,

Akbar launched the attack at his camp days before the soldiers were to move into Iraq because he was concerned about U.S. troops killing fellow Muslims in the Iraq war

Do we have to start screening our current military personel to find out where their true interests really lie? What's to prevent terrorists from joining our armed forces and then using our own weapons against us?