Wild Card: You and What Army?

 is a quest in Fallout: New Vegas. The Yes Man sends the courier to the Caesar's Legion headquarters to activate an army of dormant Securitrons.

Quick walkthrough
This quest is started by talking to the security robot Yes Man in Benny's presidential suite on the 13th Floor of the Tops Casino.

There is a locked door in the weather station building on top of The Fort that is required to be opened elsewhere. It needs the platinum chip that Benny had. It will be on the body of Caesar after you kill him in the camp. Alternatively, Caesar may give you a quest to investigate the door under the weather station and destroy whatever you find there, if you come to meet him after killing Mr. House and installing the Mk. 2 securitron program. If you accept, he will let you enter, at which point you can either destroy the army or activate it(Caesar will assume that the rumbling of the Army activating was whatever you used to destroy it.)

Note

 * If you agree to "destroy" House's robot army, you'll get your stuff back inside the Weather Station. Once you're finished upgrading the Securitrons, you have the option to kill the 3 Legion guards. If you do this, the rest of the camp will be none the wiser and you'll be able to run around The Fort with all your gear intact. This'll make taking out Caesar and his guards a lot easier.
 * Warning: The 3 Legion guards Caesar sent to watch you are pretty tough with Ballistic Gloves (knock you down explosively with every hit) so prepare accordingly (Sniper Rifle + Turbo + Slasher worked for me).

Bugs

 * Caesar can glitch when you talk to him. He will tell you that he wants you to do something but the only option was "I'm done working for you". I arrived without incident (after doing a TCL flyby to overcome the Cottonwood massacre) at The Fort even if I was Hated thanks to Caesar's invite/mark.
 * After repeatedly talking to Caesar without success, I started poking around his tent (I picked his chest and talked to his peeps). Before leaving, I came back to Caesar and lo and behold, the option to investigate the Weather Station appeared.