at camp lejuene in 1966, i can remember firing an m1 rifle grenade in exactly position number 2....it was about the coolest thing i ever did with my pants on!
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http://www.billricca.com/pubs/positions_%20pics.jpg
note:we had used m14's in boot camp at parris island, graduated march ,'66. when we got to ITR, we used m1's with
BFR's for grunt tactics training.