Spc. Leonard Estraca, a native of Mathis, Texas, checks a Sons of Iraq, or Abna'a al-Iraq, member's heartbeat during a medical screening in Radwaniyah on Aug. 21, 2008. Estraca serves with Battery B, 1st Battalion, 320th Field Artillery Regiment, 2nd Brigade Combat Team, 101st Airborne Division (Air Assault), Multi-National Division - Baghdad.