Supposed you have a secret project of great importance, that is so secret that outsiders mustn't even know that it exists. Since there could be spies everywhere and the true purpose of the project may even be hidden from higher-ups and allies, everyone who knows about it may only speak of it by a secret code name. Much too often in fiction, the chosen code name does pretty much the opposite by almost spelling out what the whole thing is about. Instead of concealing the purpose and nature of the project, it's exactly about What It Says On The Tin.

Examples:

• Project Lazarus in Mass Effect 2 is about bringing a dead person back to live.
• Parodied in South Park The Movie with Operation Human Shield, which was supposed to be executed by the purely black army unit.
• The allied Operation Gomorrah in World War II. While it doesn't reveal the target, it was obviously about annihilating a city with a large scale incendiary bombing attack.