1) A Bullet
2) Whiskey
For the field amputation that you refer to, I'm assuming that it would be a dangling limb.
Put the bullet in the pts mouth, for him/her to bite down on.
Pour whiskey over the wound, to help in sterilization, pour whiskey down gullet of pt., to help in pain control, pour a couple of shots down the gullet of field medic, cause it's gonna be messy.
After above 2 items are in place, grab hold of dangling limb and ......PULL/YANK as hard as you can.
Then take a couple more shots of whiskey for good measure.....if there's any left.
