Bungie has announced all six members of Nobel team. Nobel team is the team shown in the trailer at SGA and are who you are fighting with in the game.
                               
      The first member announced is Carter the leader of nobel and part of the spartan lll program.
                             
                                  
     The second member of nobel is Emile (no it is not pronounced Emily and yes he is a guy). Emile is the spartan in the trailer with the awesome helmet with the skull on the front. Emile comes from Eridanus ll, a UNSC colony witch just so happens to be the home planet of Master Chief. Emile is a warrant officer and does not speak unless he chooses to.
                           
                                     
      Thirdly is Kat... yes a girl. Kat had lost her arm in a battle so now she has a robotic replacement witch keeps her in good condition to kick ass. Kat is part of the spartan lll program. Kat has been one of the survivors of a suicide mission witch are what spartan lll's are used to ensure completion.
                          
                                     
      Next we have Jorge who to me is the one ensured to kick the most ass. Jorge is the teams heavy weapon expert and is the only member on the team in the spartan ll program. Jorge's armor is Mark lV yes the same as Master chiefs.
                            
                                     
      Jun is next. The teams sniper. Jun is an expert with the SRS99D sniper rifle and once he kills someone he dose not give a **** after.
                            
                                       
      Finally there is the protagonist of the game (Nobel 6/you). Bungie says you will be able to customize your players gun types, armor abilities, and hopefully visual appearance as well. Nobel six is the one in trailer who joins up at the last minute before they enter the biggest battle on Reach ever.
                           

     If you want to learn more please click the link below and scroll down to learn some more about team Nobel.

                    http://www.bungie.net/Projects/Reach/default.aspx