Add a unique sound effect for killing the last person of the enemy squad. The killfeed make no distinction between killing a member of an enemy squad and killing the last member, that is to say a squad wiped.
Text notification for a squad wipe does not suffice as the texts of the kill notification are very cluttered. Upon making a kill the player could be notified on the multikill counter, type of weapon kill counter, headshot kill counter, type of vehicle destroyed counter, enemies name.
All of these text notification for a kill have the same color, the same font size and are only displayed briefly. The white text color is even harder to see against lighter environment in the background making the kill notification is hard to read. Vital information could be lost during gunfight as the player’s eyes are preoccupied with tracking the enemy movement instead of reading the text.
Example:
Texts for a kill notification are cluttered and hard to read against lighter background
For these reasons a sound notification for a squad wipe would be better. Not only would it be satisfying to eliminate the last squad member, the players would have the critical information they need to make their next move.