220px-F1_grenade_DoD.jpgType in the content.

Hand Grenade
This was a grenade detonated by the pulling of a pin, unlike the Ketchum grenade which was detonated by a pressure plate.
Some different types of this grenade are:
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M67 Grenade (shown above)
Russian F1 Grenade(shown far top)

Online Sources:
http://en.wikipedia.org/wiki/Hand_grenade
Image Sources:
http://en.wikipedia.org/wiki/Hand_grenade