Let's review the evidence:
Tome after tome of Jane's: No mention of this capability AFAIK.
Conways: Nothing.
USNI: Nothing.
Other printed sources: Nothing.
Russian sources (you can often find stuff there that nobody in the US will dare talk about): Nothing.
Sonalyst sims, widely regarded as the best unclassified source: Nothing.
Clancy's non-fiction books (e.g. "Submarine"), mass-oriented but fairly useful: Nothing.
Non-fiction books by other authors: Nothing.
Sub guys in our beta group: Nothing.
Sources supporting this:
- Clancy's "SSN", generally regarded as a low-fidelity sim bordering on arcade.
- You (biosthetique).
You can probably appreciate my skepticism.
I can only see two possible explanations:
1) This capability does not exist, which is why nobody out there is talking about it. You have been misinformed, either by error or on purpose (lots of COINTEL pros out there).
2) The capability does exist, and the US defence establishment has been wildly successful in keeping it under wraps and has actively silenced anyone attempting to reveal it (incl foreign entities - I'm sure the Russians would talk about it if they knew and were able to). Which in turn means that about half an hour after we provide an update for Command that models this capability, I will be abducted by the local direct-action outfit in Athens and shipped off to a suitable facility for further interrogation.
In either case, I don't see much of an incentive for including this capability in Command
