Forward Operating Base Delhi massacre are murders that occurred on August 10, 2012 at the Forward Operating Base Delhi within Garmsir village, Helmand Province, Afghanistan. A young man, who had been allowed to live on the base, killed three unarmed US Marines and one marine was also severely injured.

Based on that paragraph can we conclude that this sentence is true?
There were four US Marines harmed during the Forward Operating Base Delhi massacre on August 2012.
Yes