Enemies drop dogtags that appear bright yellow upon death, which provide a score for the team if collected, known as confirming the kill. If a teammate drops a dogtag, it appears as bright red, and if collected, the kill is denied, which prevents the enemy from confirming it. However, the player now gets points for killing an enemy and for confirming a kill, both of which will go towards the team score. Denying the kill gives points, and if the dogtags were the player's own, a Retrieved score is awarded. Additionally, the dogtags will disappear if not collected quickly enough.
These are final versions. If any issues, please post in this thread.