These holes are from a hand grenade that blew up outside one of the tents where we slept. Thankfully the Marines that would have been asleep here were out on a night patrol when the attack occurred. It was thrown by a 15 year old boy (Reserve any judgment and read my book if you want to know the full story!)
A hand grenade is a 14 ounce spherical steel body filled with 6.5 ounces of composition B explosive. It has an injury radius of 49 feet and a fatality radius of 16 feet. When a grenade detonates it sends shrapnel in every direction at a velocity of 24,000 feet per second. Fragments can disperse up to 825 feet.