"Sharpened prybars" to quote DR himself:

"beefier and larger survival/hunting knife or "sharpened prybar" with a 3/16-inch (4.75 mm) to 1/4-inch (6.34 mm) blade that has become popular in recent times and which is prefered by many military-oriented survival instructors."

""sharpened prybar" style knife, like a Becker, RAT or Busse."

http://www.equipped.org/rsk_mk3.htm