1. Look up dogtag spawning locations from here
http://imgur.com/a/hzBRN [imgur.com]
2. Map needs to be live and on ranked server so don't bother looking on maps that have less than 4 players and haven't started.
3. Limit your server view to view only a specific map then join one at a time to bum rush each spawn point.
4. Join a low player count server that has 3 or 4 or a match that just started or about to start.
5. Spawn as Reacon with MAV and Spawn Beacon.
6. Dogtags don't spawn for at least a minimum of 2 minutes but can take as long as 15 minutes (My mates and I have confirmed 2 minute minimum for first spawn).
7. Bum rush any spawn location and plant radio beacon (Can be used for spawning closer to dogtag location if you locate one with your MAV).
8. Go to second location and deploy your MAV (Need to fly very close to spawn locations because dogtag's don't glow).
9. Fly MAV to other locations while occasionally exiting out to check if one spawned by you.
10. If you hear a noise that sounds similar to awards won at end of match while you are in-game that means someone else just picked up a dogtag.
11. If a dogtag has been picked up the next dogtag will respawn between 8 and 15 minutes in another location.
12. If after 15 minutes no dogtags have been found then leave match and go to next server because dogtag is in an unknown location.
13. Ask for who picked it up and where exactly so you don't waste time looking in the same place.
14. If you pick up a dogtag the match needs to end for you to earn it so if server crashes you will need to do it over.
15. If you have friends that can help you use them and have them sit in a single spawn point and use there MAV's to look elsewhere.
16. If you finally find one knife the box to brake it and then pick up the dogtag (If you can't knife the box then either you don't have access to it or it's a brick).
17. Stop asking for help on the forums.