One thing I loved about Halo 3: ODST, apart from playing the part of an ODST itself, was the two unique weapons we see and use throughout the Campaign and Firefight. The suppressed SMG and suppressed pistol, leading an element of stealth to the Halo franchise. I would have loved these two weapons for custom stealth missions, Machinama’s for ODST’s and various other ideas. What I would like to know is why did they remove this feature from other games? If possible could we see them again?
I love the Suppressed SMG and Magnum those are probably my favorite weapons after the Shotgun and SPnKr.
I believe they already added the pistol in Halo 5 Guardians 
It was neat that they introduced 2 weapons we’ve seen before, just silenced and modified a bit. It was a good surprise!
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> I believe they already added the pistol in Halo 5 Guardians
They did add it.