What is the military term for calling attention to yourself, in a negative way?

There is a military term or idiom, which I cannot recall exactly, that essentially means calling negative attention to yourself. For example, you are doing something you know you shouldn't be doing. By asking the question, "Hey, is it OK to do this?" you get yourself in trouble; when if you kept your mouth shut, no one would have noticed what you were doing.

It had something to do with having a silhouette; it made me think of walking on the crest of a hill, where you could be easily spotted by a sniper, as opposed to walking with the hill behind you, so you didn't stand out. It's not "keep your head down".

I believe that a/the military term is called "skylining."

b. Bounding Element. Maneuver is inherently dangerous. Enemy weapons, unknown terrain, and other operational factors all increase the danger. When maneuvering, the platoon leader considers the following.

(1) The bounding element must take full advantage of whatever cover and concealment the terrain offers. By enforcing and applying the principles of terrain driving, leaders and drivers, respectively, can enhance security. For example, they should always use intervening terrain and avoid "skylining."

(army field manual 3-21.71 chapt 3 (2002))

Never stand on the crest of a hill. It makes you such an easy target. The whole point of camouflage is to make it hard for the enemy to acquire you as a target. You can be easily defeated if you are against the blue sky. It’s where the term “skylining” comes from. When you rat someone out, you are skylining them.

(source, purportedly an interview sourced on a video wargame website)

"avoid skylining, which occurs when a sniper's silhouette is visible against the sky" source

". . . not skylining yourself or your positions . . . " source

Are you thinking of making yourself "silhouetted"? Another term used is "conspicuity".

Those terms are used in the U.S. Army Field Manual FM 20-3 "CAMOUFLAGE, CONCEALMENT, AND DECOYS".

"skylining" is the military reference to standing on a ridge line allowing your body shape to be silhouetted against the sky. This can happen on clear day, cloudy day, night, etc.