How do you get into Fort Zancudo without getting caught?

I'm curious, how exactly does one go about entering Fort Zancudo without drawing any unwanted attention? Is there a specific route or tactic that's proven to be effective? Perhaps there's a disguise or a distraction technique that's been used successfully in the past? I'd be fascinated to hear about any strategies or tips that might help someone navigate the security measures and make their way inside undetected.