McCarran can be walked to or, with sufficient NCR rep, Boone, or a trooper disguise, you can take the monorail from Las Vegas Boulevard station in the Strip.
Loot:
Sniper rifle and two magazines on a bed in the 1st recon snipers' tent.
Star cap can be purchased or stolen from Contreras.
McCarran has a lot of quest starters.
Dr. Hildern will ask you to investigate Vault 22 in There Stands the Grass.
Major Dhatri need three Fiend gang leaders killed in Three-Card Bounty.
Colonel Hsu could use some help catching a spy in I Put a Spell on You.
While helping Colonel Hsu, Lieutenant Boyd will be willing to get you started in tracking a missing trooper in the White Wash.
There also unmarked quests:
Boyd could use help interrogating Silus, a captured Legion Centurion.
Boyd could also be given evidence to bust Contreras' illegal weapon sales earning the .308 rifle This Machine.
Farber could use some help improving McCarran's meals (quest currently broken, don't bother).
Trooper Christina Morales can use some help retrieving her husband's body from some Fiends.
McCarran features two triggers that can be used to trigger Veronica's companion quest.
One is activated by either the center or eastern set of doors near Colonel Hsu's office.
The other can be triggered by speaking by Dr. Hildern for the very first time with Veronica in your party.
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