Have you ever been asked by a General Officer to not share information?

My General asked me not to answer this question!

Yes. Directly too.
In Civil Affairs, we find out lots of inconvenient facts. During the Surge year in Iraq, the push was to hand off battle space to Iraqi Army units. As we were making capability assessments, it became very clear that Iraqi commanders were overstating their capabilities and manning in order to look good to their superiors.
My frank assessments were valued, but kept close hold. There was some pretty embarrassing stuff in there. "Patrols" that never happened. Consumption reports for fuel that could not possibly be true. Manning levels that were not borne out by any objective observation - sometimes varying by over half. It was pretty clear that many would simply sit on their base, feeling important, collecting their paycheck, and skimming fuel money (and I didn't know it then, but later found out that ghost Soldiers in these units got paid, too - also lining the officers' pockets).

But the momentum was to start reducing our footprint, so this information was only briefed by me once.

CPT (Join to see) Of course. With a TS/SCI clearance you get that a lot, lol.

I'll say this, though: anybody that thinks the government can't control what the media gets is fooling themselves.