Bureau, Department
Your nation's flag sits on top of a caped mouth. This is the symbol for the "Bureau of Secret Things." It's a special department of your government made to keep things hidden.
The cape covering the mouth represents how this bureau never talks about their secrets. The flag represents your country. Think about all the cool secret things the Bureau of Secret Things must have.
きょく
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The bureau's best-kept secret is cloaking devices that cloak you (きょく) with the press of a button.
Now, this mnemonic isn’t perfectly close, but the goal is to get you close enough in your brain so that you can remember きょく later. If you can get to CLOAK YOU, then you can get to きょく much easier than just trying to get there from scratch. So imagine working in this bureau and getting to cloak yourself all the time.