Bk09 - Combat Bowie - Well well well. The big chopper in town... Top one is the current Ka-Bar offering with the freebie BK13. The middle guy is by Camilus and is my pedestrian user, and the bottom one is the Camillus backup I grabbed while the grabbing was grabful. The next photo will show a comparison of the slightly thicker Camillus vs the slightly thinner Ka-Bar - it's nothing to be concerned about, really! Other variant of the BK09 include a BK091 desert model, and a BK09HH - Hog Hunter, the false edge is sharpened - I thought this was a bit much, so never grabbed one - hah.
BK10 - Crewman's Utility - Now, I love me my Campanions a lot, but these guys are nifty in that they are a bit lighter, bit thinner, and that's a fine option if you need that, and aren't in mind of field stripping a Buick Guess which one has the polished convex edge? There also exists a BK101 desert model. Haven't seen one of those yet.
BK-13 - Becker Necker - I believe these are covered quite well here: "Becker's Neckers - BK11, BK11CSM, BK13, BK??" http://www.bladeforums.com/forums/sh...d.php?t=608725 but just for picture's sake: