Ranger journal

Ranger journal is a mission log kept by Ranger Dobson in Fallout: New Vegas. It can be found in his hide-out in the southern Hidden Valley bunker, next to a broken radio.

Transcript
Entry 1 can only be read if the Courier enters the bunker before getting the request from McNamara to remove Dobson from the south bunker, e.g. Dobson will not be there yet.

Entry 2
Entry 2 to 4 can be read after the start of Still in the Dark, where the Courier is asked to drive off Dobson from the south bunker.