what's their answer to persian gulf missile?? or shkval/hoot torpedo?? or cruise missile launcher boats??
Persian Gulf missile as in Khalij Fars?
Both Softkill approaches and hardkill approaches have been devised to neutralize this kind of threat by now.
[1] Softkill approaches include powerful electronic warfare gear and cutting-edge decoy systems to jam/spoof/confuse incoming threats. One of these decoy systems is NULKA which is very effective against radar-guided threats of types. FYI:
https://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=587&ct=2
Should the entire spectrum of softkill approaches fail to work (unlikely but let us assume otherwise), hardkill approaches will come into play next or in tandem.
[2] USN have developed incredibly maneuverable SM-2 Block IV and SM-6 interceptors to neutralize ASBMs and much more - hardkill options. To give you an idea; during the course of unadvertised trials in 2016, these interceptors defeated advanced ASBM variants simulating the capabilities of Chinese DF-21D class.
There.
Shkval/hoot torpedo?
Again, both softkill approaches and hardkill approaches have been devised to neutralize this kind of threat by now.
"At present, American submarines use a combination of electronic warfare jammers and acoustic decoys to defeat incoming torpedoes. This works well against threats that use active and passive sonar to home in on their targets." - Tyler Rogoway
For potential targets which might be cutting-edge to the point that they can get through American softkill approaches, American hardkill approaches will come into play or in tandem:
"The Navy has already developed multiple variants of the CVLWT, the best known of which is the Countermeasure Anti-Torpedo (CAT), also called the Anti-Torpedo Torpedo (ATT). This is a defensive “hard-kill” interceptor that is supposed to destroy incoming torpedoes by either slamming into them or destroying them with its explosive warhead." - Tyler Rogoway
There.
or cruise missile launcher boats??
Majority of navies do not have credible defenses against cruise missiles and ballistic missiles in general, but USN is becoming an exception to this norm.
Refer to
[1] and
[2] above; same set of defenses are also optimized to defeat cruise missiles.
Eye-openers, right?
American naval assets are equipped with (very) powerful set of sensor systems at present - technologies
that are NOT approved for export to numerous countries worldwide. These sensor systems can notice and distinguish potential targets with very small RCS such as cruise missiles and develop a fire solution for these seemingly elusive threats.
Ballistic missiles; Cruise Missiles; Torpedoes; Drones; Aircraft and whatever - all are fair game for USN now.
As for how to track Iranian naval formations and even submarines?
All of the above is post 2002 stuff, based on lessons drawn from the much touted American Millennium Falcon naval simulation.
In fact, too much to highlight in a single post. Just do your homework.