Fallen Soldier Tags in Warzone are needed to complete a specific challenge.
Players have had a whole day to digest all the content Warzone's "80s Action Heroes" event has brought to the game.
Fallen Soldier Tag Warzone: How to Collect Tags
Since the launch of the event, set locations on the map known as "Survivor Camps" are scattered throughout Verdansk. These survivor camps contain the Fallen Soldier Tags.
To find the location of one of these survivor camps in your game, drop at one of the new locations added in the Season 3 Reloaded update called CIA Outpost. You can read more in-depth about the map changes here.
Once in the CIA Outpost, head to the back where you see a map posted on a whiteboard. Interacting with this posted map updates the player's tag map with a green circle.
Keep in mind that once you or any other player picks up a fallen soldier tag, the tag for that match's specific survivor camp is gone. The fastest way to go about completing the challenge would then be to quit out of the match once you grab a fallen solider tag for that location, and repeat.
Enjoy everything new Verdansk has to offer, and happy hunting for those fallen soldier tags!