You Can Depend on Me

 is a quest in Fallout: New Vegas.

Quick walkthrough
It is given by Alice McLafferty at the Crimson Caravan camp. She tells you to deliver an invoice to Hildern at Camp McCarran. After which you are given three tasks to complete.

Detailed walkthrough
1. Simply deliver a parcel to Dr. Hildern. He can be found in Camp McCarren inside the airport on the first floor.

2. You need to buy out Rose of Sharon Cassidy's contract. There are a variety of skill checks that can be used such as barter and speech available to complete this. Once you do this she will sell her company, and in addition she will be available as a human companion. If you cannot pass the speech checks, and you don't want her as a companion, kill her in one shot (a speak attack with a decent hunting rifle does the trick) then immediately head for the door before you are informed of your NCR fame deduction, then in sneak mode, or with a stealth boy, hide and wait for the NCR hostiles to turn yellow, and you keep all your fame with them.

3. You need to convince Jamison to drop his job. He can be found at the Atomic Wrangler Casino at a slot machine. With a high speech check you can get him to immediately drop the job, otherwise you will need to run an errand for him.

4. (Optional) To acquire the Gun Runner's secret manufacturing specifications grab a Stealth boy and head the entrance of the Gun Runner's factory. Activate the Stealth boy and pick the lock at the gate, you will lose karma for doing this. Make sure are crouched and hidden. Head to the front door then all the way to the back of the building. Grab the information off the computer and head back out again. Make sure you are still crouch or else the guards will see you and attack.