Textured finish and mil specs

I am with an OEM for a defense contractor, and our application involves applying a textured finish to a knob or dial handle for added gripping ability. We cannot knurl the knob or dial handle. My first thoughts are to mix sand and paint and apply that after applying a primer; however, I know not of a military specification that allows a sand-paint finish. First, is there such a military specification? (I've been searching for a while and can't seem to find one.) Second, if there is no such military specification, is there a mil spec texture finish for the application?

Unless I'm mistaken, mil-specs will only cover the mechanical properties of the coating and being a supplier you should already have them. So the spec you are looking for should describe something like this:

the coating must withstand X amount of salt spray hours
the coating has a scrape adhesion factor of X
the coating has xx degrees gloss
the coating must be chemically resistant to X

So if you mix sand into the top coat of paint and it meets the spec, you win.

Another plan would be to go for a spatter finish. Put a base coat down of the colour you want, then apply another coat but use a large fluid tip 1.8 mm/2 mm cut the air pressure down to <10 psi and do not thin the paint. You can practice on a bit of scrap. Basically you are applying a "bad" finish, but a heavy spatter like this will give a decent texture not much worse than knurling and you will not have any problems with sand.