WHY HAVENT I GOTTEN RECON YET BUT EVERYBODY ELSE HAS PLZ HELP IM BEGGING YOU 
Recon is given to new players in waves, when 343i decides to do those waves in unknown, but Iād guess every month or so.
After trying to look at your Service Record on Halo 3 via Bungie.net, you began playing after March 31st, so be patient and wait.
thanks for the help man hopefully i get it 