Maybe your character was operating in the same place at the same time as Pearce. Maybe they were in the same regiment, maybe they shared conversation, or maybe something entirely different.
June 2005 to January 2006 - 1st Battalion, 30th Infantry Regiment
Pearce was deployed to Iraq on his first tour as a private (E-1). He would have been fresh in the field, helping with patrols and searching for insurgents, among other things. He ended by getting promoted to private second class (E-2).
May 2007 to July 2008 - 1st Battalion, 30th Infantry Regiment
Pearce was deployed to Iraq on his second tour as a specialist (E-4). He would have been fighting the insurgents, clearing buildings, on combat patrols, and dealing/coping with the constant threats.
December 2009 to August 2010 - 1st Battalion, 30th Infantry Regiment
Pearce was deployed to Iraq on his third tour as a specialist (E-4). He seemed seasoned and accustomed to danger. He would have been involved with patrols, security ops, and some other things.
August 2010 to September 2010 - Reactionary Deployment from Fort Stewart, GA
Pearce was quickly recalled from leave back to base and was hastily deployed to assist in maintaining order and disaster relief. On August 27th, he arrived to assist the National Guard near the Port of Memphis. He managed to evacuate onto the Zenith when it fell.