Missionary

 is the name given to AT LEAST two characters living in Freeside in 2281.They are being employed by the NCR force as a mean to find out more NCR citizens in the area, so they can provide them with food and water. As part of the G.I. Blues quest, The King gives the player the optional quest to investigate on some squares of the Freeside to find out more about the people who attacked his men. The player can ignore that and go directly to Julie Farkas who will send you to talk to her friend, Major Elizabeth Kieran who is in charge of the food supplies at the Ruined Store. Either will ask the player if they are a "citizen of the NCR. If the player answers "yes", the player is quizzed with three questions to prove that they are an NCR Citizen.
 * Question 1 - Who is the most popular NCR President of all time? President Tandi
 * Question 2 - What was the original capitol of the NCR? Shady Sands
 * Question 3 - What animal is on the NCR Flag? Two-Headed Bear

Answers: (SPOILERS!) 1. 2. 3. Two-Headed Bear

This will give you access to Missionary's note, which reads cryptically "Hope is the key." Hope is actually the password you give to the two NCR guards outside the Ruined Store they use to supply the NCR Freeside members with food and water. This note can also be obtained by killing Missionary. There is no karma damage associated with this, nor will it prompt locals to attack, but it will hurt your standing with the NCR.

Appearances
appears in Fallout: New Vegas.