Chimera aka ultimate "Marine Combat" aka GI issue Randall-type #14
The blade is the unserrated version of the USMC bayonet. That should be all you need to know as for toughness. As a non-issue item, the edging of the clip is not done due to legal restrictions in some cities/areas, but easily done to get into true fighter trim. It is essentially, as is the bayonet, a factory copy of the legendary Randall #14 in shape, and a beautiful functional shape it is. A knife which is 50yrs overdue, which a soldier/grunt can actually afford. It is the "kabar"/Marine combat/utility knife which will not break, even in harsh abuse. This is as far as the blade and handle goes.
It DOES need to be pointed out that NOTHING is unbreakable, and the pommel with reduced shoulder at tang for seating can be broken with enough pounding, such as breaking bricks (a common sense thing, right?). The Chimera has the exact same pommel arrangement as the Army ASEK for helicopter crew egress, and it passed trials for use with no problem, which does include scoring and breaking canopy. For that matter, same stepped tang as the Marine Combat, the bayonet, and the venerable Jet Pilot Knife. But bricks were not part of the test, ok?
Meanwhile, this knife will take about any stabbing, hacking, batoning, pounding one can dish out. Put conversely, it is finally the bayonet blade perfected into a useful knife.
If only this knife had been available years back, how I would have loved it as a kid and as a soldier. You guys and gals currently serving have no idea how blessed you are that such things as this knife are now available.
The thing even comes in the same style sheath as the USMC bayonet with triple retention, removable steel friction clip, fully MOLLIE compatible, and with replaceable ceramic sharpener on back. As you folk know, a good knife is rare, and not needing to drop even more money on decent sheath after knife purchase is even rarer.
If you want lighter, the Special Purpose SP6 has the same blade minus any steel guard/pommel, but you also will lose this nifty sheath. Keep that in mind when deciding between the two.
All I can add is, if you want your combat knife, then here's your combat knife.