In my 'hood, bridge dwellers tend to use the ubiquitous mineralized and densely packed stone, also known as rock, bonker, or thumper. The man made version, concrete, is frequently used in smaller broken chunks of 12" to 16."
Esav is right, as a sometime rural delivery person, a kerambit would have been useful, especially approaching houses to deliver a parcel. Some folks let their grumpy little puppies forage for their sustenance, and I always questioned their neighborliness when I saw a mouthful of kerambit like teeth and glowing red eyes appear from under the porch. But, carrying a kerambit into a Federal building these days? Not.
I suspect those who are looking for employment who wish to exercise their hard won skills in self defense with a knife might apply with Aegis, Blackwater, Whackenhut, or various others specializing in security contracting and escort. Nonetheless, you will still be issued a firearm, simply because no one believes any adequate defense can be mounted with a knife, especially in this modern era of firearms.
Therefore, whether the OP is not an actual combat veteran or otherwise qualified to ask, the question, regardless of one's initial visceral response, is quite accurate in a sly way in pointing out the kerambit's overall uselessness in modern combat.
The trolls are possibly the ones pointing fingers in disbelief.