Oh, and I think Guzman may have been a PFC, not a Lance, at the time of the ambush.
LCPL Tatum, in his statement to NCIS agent Marshall, March 18, 2006, refers to
“the fourth HMMWV (highback) had LCPL TERRAZAS as the driver, LCPL CROSSON as the A-Driver, and LCPL Guzman as the gunner.”
http://warchronicle.com/DefendOurMarines/Documents/LCplTatumNCIS.pdf