Transferring money to the US without looking like a terrorist

[Alex SImon]

Need help from someone who has some knowledge of international money transfers.

I am a US citizen and I work in Saudi Arabia, which as you may know is part of the tumultuous Middle East. Lots of sand and jerks dressed in black making ugly Youtube videos out here. Anyways, I'm looking at the task of transferring my money back to the US so it can be used for REI. I know that large cash transfers from the Middle East get flagged sometimes, but I don't know the exact criteria for this. I have a good friend who works out here with me and he is fronting me a bunch of capital to help me accelerate my acquisition of properties, so I'm worried this will throw up a red flag somewhere.

Does anyone know how to transfer all my cash back to my US bank without freaking out Homeland Security or getting me audited by the IRS?