im not permitted to carry a fixed blade on duty, though i don't know if i would anyway.
so i think i have found the next best thing(s).
i carry a waved emerson combat kerambit support side in my sap pocket. in my gun side sap pocket i have a rotation. lately its been: emerson cqc8, emerson persian, hinderer xm18, or spyderco s90v military. at my agency, ive converted quite a few people to a waved emerson knife. mostly kerambits, but there are a few commanders as well. maybe 10 total. there are a few benchmades, a few kershaws, and lots of spydercos.
for the more budget minded, i normally recommend a spyderco waved endura (about $65).
for a fixed blade, consider one from hide-away knives. they make a rig that attaches to the rear of your mag pouch. pretty slick design.