The Ranger station Echo is a place in the Mojave Wasteland. It is located to the far northeast of Camp Searchlight and not-so-far northeast of Coyote mines. There are two human officers and several ghoul rangers. Private Edwards can be found after the conclusion of We Will All Go Together if The Courier suggest he go here.
This station seems hard for some players to find. It should be approached from the west; it is inaccessible from any other direction, and you will likely wind up wasting hours trying to get around cliffs from any other direction. Approach from the West; a good strategy is to start around Coyote Mines, and work your way north-northeast from there, then approaching directly west when you're parallel to it. You'll make slight turns but it's an easy approach otherwise.