bungie did
Halo Reach, Halo: Combat Evolved, Halo 2, Halo 3: ODST, and Halo 3 were made by Bungie; Halo: Wars was created by Ensemble Studios; Halo: Combat Evolved Anniversary and Halo 4 were created by 343 Interactive
A Hawk is not from Halo 3 it is from the game Halo Wars which is not associated with Bungie. Halo Wars Ensemble Studios created the Hawk. You may be thinking of the Hornet or Pelican.
When Halo 3 was formed.
if you mean in forge, then no.
halo 3 obviously
343 studios have taken over the rights to halo and will be making Halo 4 and potentially more games after that. Bungie created Halo:CE, Halo 2, Halo 3, Halo ODST, Halo Wars and Halo:Reach.
Halo 3: ODST is the newest of the two, but not the newest Halo game.
Halo effect was created in 1920.
Halo in a Haystack was created in 1994.
Halo Friendlies was created in 1998.
Halo Star was created in 2004.
Halo James was created in 1988.