There are lots of S-70 variations. In the 80s, and 90s The USN had three types: SH-60B ASW version, SH-60F ASW with dipping sonar, and HH-60H with did search and rescue, special ops, and anti-surface.
More recently there are two new versions MH-60R and MH-60S. MH-60R is ASW and is built new or converted from SH-60B/F. MH-60S "Knighthawk" is built new and replaces HH-60H, CH-46D, UH-3H, and HH-1N.
The US Coast Guard HH-60J "Jay Hawk" was the basis for the USN HH-60H.
H-60 variants used by the USN/USMC/USCG are slightly better than those used by the US Army, and way better than those used by the US Air Force.