Sitrep Pro is rediculously overpowered, IMO, if not glitched. According to Call of Duty ELITE (on the console app) the description for Sitrep Pro can be qouted saying "Sitrep Pro denies enemies the ability to sneak up on you, causing all but those with Dead Silence to give away their approach from a distance." So either someone messed up when they wrote that, or Sitrep Pro was not meant to cancel out Dead Silence. In the previous games mentioned, the equivalents of Dead Silence weren't removed by the perks, they were just dampened. In other words, Dead Silence wasn't completely silent but still harder to hear. I don't think Dead Silence should nullify Sitrep Pro, but it shouldn't be as easy to hear a player using Dead Silence as it is to hear a player using something like Stalker.
There is another issue with this, however. Dead Silence already dampens the effects of Recon, so making it harm two perks would almost be worse then Sitrep Pro removing the effects of Dead Silence. The best thing to do would change Assassin so that it doesn't remove your name if the enemy isn't using Marksman, and change the six second recon timer over to an Assassin Pro ability, then make Dead Silence not immune to Sitrep Pro, but at least quite a bit quieter then other team mates not using Dead Silence.
tl;dr
Dead Silence shouldn't nullify Sitrep Pro, nor vice versa, so make them meet in the middle.
