Eighteen spent bullet casings were recovered from the room, and several matched Platero's assault rifle.
MSN: Soldier found guilty of murder in Iraq shootings
Neftaly Platero guilty of two counts of premeditated murder and one count of attempted premeditated murder after a weeklong trial.
Prosecutors said Platero got angry after all four roommates, including Platero, were told they would be subjected to extra room inspections.
Platero faces life in prison with or without the possibility of parole.
Prosecutors said 34-year-old Platero, of Kingwood, Texas, opened fire on his roommates as they readied for bed at Camp Fallujah on Sept. 23, 2010.
Platero's supervisors testified he came to them twice hours before the shootings to complain that his roommates were letting their room get too dirty.
His attorney, Guy Womack, said Army investigators rushed to focus on Platero as their only suspect even after forensic evidence failed to point to him as the shooter.
Platero's defense attorneys insisted Martin's account was a fabrication.
Platero didn't testify during his trial.
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