I have a better guideline. How about: "Keep it holstered". Any time you clear leather, you're risking an ND. Why make them check firearms at all? Or, if you absolutely insist, why not have a sand barrel or something?
I have carried for 25+ years. I still do all of the above. Don't ever get complacent handling firearms.
Camp Pendleton, too, also Stout Field...+1 on the sand barrel...they have them outside almost every building on Fort Riley.....with a sign explaining what to do no less.....