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

 * Speak with Alice McLafferty at the Crimson Caravan to begin the quest.
 * Deliver a parcel to Dr. Hildern. He can be found in Camp McCarran inside the terminal on the first floor.
 * Buy out Rose of Sharon Cassidy's contract. Speak with her at Mojave Outpost, at the bar. You can complete this objective via a variety of skill checks and will be rewarded with 500 caps and NCR fame regardless of which option you select (barter, speech 50/75). (Once she sells her company she will be available as a companion)
 * You need to convince Jamison to quit his job. He can be found at the Atomic Wrangler Casino at a slot machine.
 * You can convince him to quit his job without any checks and earn 300 caps
 * You can convince him to quit using a speech check (50) and earn 500 caps
 * If you have a high enough reputation with the NCR, you can also convince him to quit and receive 500 caps (no skill check needed)
 * You can kill him if you have a silenced weapon so long as no one catches you
 * Acquire the Gun Runner's secret manufacturing specifications.
 * Head to the entrance of the Gun Runner's factory, and activate a Stealth boy. Pick the lock (Average) at the gate (negative karma earned). Make sure you are hidden, and not detected. Head to the front door then all the way to the back of the building. Grab the information off the computer terminal to the right of the room, and head back out again. Make sure you are still crouching or else the guards will see you and attack. (While crouched, if there are weapons on the workbenches, you can take them and the guards will not notice.)
 * Alternatively, There is a shift change sometime between 10pm and 11pm (while the gun smiths are conveniently asleep) during which the player can follow a guard through the locked gate.  The guard will leave the door unattended briefly to patrol the compound.  By moving quickly and quietly, the building can be entered, the data retrieved, and the compound exited before the guard returns to his post.
 * Alternatively, when requested, you can deny the Gun Runner's section of this quest altogether. You will still receive the experience, and the objective will be completed. It will also allow you to continue onto the next quest that McLafferty offers you.

Bugs

 * If you have completed "There Stands the Grass" quest, Doctor Hildern might glitch and not accept your parcel. In this case, the console command "setstage 000EDB37 15" will complete first stage, and allow you to progress. In the case of the XBox 360 and PS3 for which this bug also exists, there is no known way to correct the lack of an option to give Dr Hildern the invoice.
 * If you are having Craig Boone as your companion, it would be ideal to have him wait outside when you're sneaking in as 4 out of 5 times he would attack the Gun Runner Smiths in melee mode when they go into his attack range, even if you're crouching and using a stealthboy. This might be triggered by you pickpocketing the smiths too. Thus jeopardizing your sneaking mission and you will be attacked by Isaac and the Gun Runner Guards upon leaving the factory. You will still be able to purchase from Vendortron though.