It can be given to the player by Reilly during Reilly's Rangers if the player accepts to help her rescuing her men on the roof of the Statesman Hotel. If she is not talked to in The Chop Shop, the password is given by Butcher at the hotel's door, after helping them past the super mutants.
Reilly informed me that the password to Ranger Compound is Reilly0247.
- If Butcher gives the note, the text of it isn't entirely correct anymore.
- The password of the note likely indicates not only her year of birth, but also the month. 02 would stand for February.