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Singh was part of Sgt. Lopez's squad when they boarded the Mona Lisa. After a battle in the Hanger the marines split up.
After discovering John Smith and enduring his betrayal, Singh, McCraw and Lopez continued on, from there they encountered their first flood combat form, a large four legged mutation, Singh was instructed to take out the legs as the three worked to kill it. In the process he was trampled whilst reloading.
- Given his surname being "Singh", it would appear that Raj is of Sikh decent.