Experts say Johnson's medical path is the determining factor in comprehending his mindset on the fateful night of July 7, when he opened fire at the peaceful police brutality rally.

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On Monday's edition of NewsOne Now, Roland Martin and his panel of guests discussed the violent acts committed by Johnson and Long and what is causing these men to commit such heinous acts against police officers.

In March 2009, Johnson joined an Army Reserve unit in Seagoville, Texas, and served four and a half years. He was sent to Afghanistan in 2013 and served eight months with the 420th Engineer Brigade.