National Guard Cav period: We had to wear an M9 Bayonet most of the time in the field. Other than that I had a $10 folder I bought from top because I was a broke high school/college kid who couldn't afford a decent knife. The screw in the pivot pin kept falling out.
Eventually bought a Gerber Urban Legend to suppliment it.
3rd COSCOM period: Upgraded to the full size Legend and still carry one today. The rubber grips fell out of the second one I bought because the first "disappeared". Interchangable jigsaw blades are definitely a selling point. Bought a Gerber Applegate-Fairbain Covert folder and carried that for a few years.
10th SFG(A) GSC period: Upgraded to a Benchmade HK Auto-Axis clip-point for my deployed folder, and picked up and aluminum-scale Kershaw Splinter for legal stateside carry. Keep a Cold Steel Safe-Maker I on the left shoulder strap of my body armor. Also have an issued Benchmade strapcutter low right on there.
I have a few other fixed blades, but don't really carry them.