OPSEC

Operations Security.  Not tipping your hand to the adversary.

Before Clinton's Kosovo war started up, Whitehouse staff burned the midnight oil.  The Reporters knew something was up because the closest Pizza joint was making big 3AM deliveries to 1600 Pennsylvania Avenue.  It'd be like the Germans noticing that Ike's Lucky Strikes supplier was laying in extra cartons in early June, like he was gonna be under extra stress.  Or like noticing that condom sales in East England where Patton FUSAG fake army was supposed to be prepping for a Calais landing, while condom sales were UP in West England across from Normandy.

OPSEC applies to you too.

It's one reason I prefer Conceal Carry over Open Carry.   Even assuming Open Carry was socially acceptable everywhere.

NRA Sticker on the Durango is bad OPSEC.  That might be a good truck to break into and check if I am not around.  And I am often not around

A sign in my picture window saying the house is "protected by .357" is bad OPSEC.  Perhaps a deterrent when I am home, but I am often not home.

Burglar DOES break in and sees gun cleaning gear in the basement, shot up targets hanging on the wall, a .50 shell casing from that one time I shot a Ma Deuce, American Rifleman magazines on the coffee table, Cheaper than Dirt catalog on the back of the terlet.... Bad OPSEC.  A burglar will check extra careful for hidey holes and what behind that 'junk' in the basement.  Maybe a gun safe...

More OPSEC:  eschew the shoot-me-first vest.  Unless you are a 1980s photographer by trade.  Or a Han Solo cosplayer.  You don't want someone to 'make' your holster outline under your suit that you are wearing on a too-warm day, either.  Do what you can about that, but there are limits.  I like to tool around Ocean City Maryland's boardwalk in the summer wearing my Speedo trunks, tank top T, and flip flops.  If I was allowed to carry their I'd have some concealment problems to solve in my usual outfit.