The Space Shuttle had various ways to abort a mission. These included shutting down on the launchpad before the SRBs ignited (RSLS), turning around to land at a runway near the launch site (RTLS), landing on a runway on the other side of the Atlantic Ocean (TAL), circling the Earth once before landing at KSC (AOA), continuing the mission in a lower orbit (ATO), and having the astronauts bailout and parachute to Earth.
Most of these modes either leave the vehicle on the launch pad, or land the orbiter safely on a runway. However, there was always a remote chance that the astronauts would need to bailout. To this end, the ACES launch suit contains a parachute, life raft, and survival gear.
In this case, what military forces were assigned to assist with the search and rescue of shuttle astronauts? Were they Army, Navy, or Air Force? Were elite units such as Navy SEALS involved? Were military forces from other countries involved as well?
Not related: Did the Space Shuttle have "military uses"?