The concept of "free infiltration" is definitely a novel one in Metal Gear Solid V: The Phantom Pain, but what inspired it?  Director Hideo Kojima himself talked about it on Twitter.

Kojima-san also explained the origins of the gold and silver shields in the game:

Lastly, we hear Kojima-san's advice on how to make a good emblem for your unit:

What's your emblem like? Did you follow Kojima-san's advice, or maybe you selected a completely different motif? Feel free to show it off in the comments.