I use a lot of scent killer spray and probably for a different reason than most, so I don't stink like the rest of the guys. I use it to spray my uniforms (lots in the armpits), t-shirt, and underwear in the summer months. I spray them, let them dry, stick them in a gallon ziplock (or compression bag), and bleed all the air out. This goes with me on our frequent field/situational training exercises that last for several days. No showers (just field hygiene) and minimal gear means you will smell like a bucket of *** in short order. This makes me feel/smell sooooo much better than the other guys out there. They will smell so bad by day two that you can find their patrol base at night without night vision devices, just come up from down wind of where you think they are.
I also do this before I go out of state on a hunt.