The USAF definitely has a game plan, even a Space Command. the civilian echelon may not have one, but the military echelon does.
Shalom,
Maksim-Smelchak.
The USAF is barred from actual space warfare by Treaty. (Specifically the Outer Space Treaty.) Their primary tasks (according to a relative who worked there, and another relative who routinely coordinated with them) are
(1) Designing, Launching, and Operating US Military Satellites for USAF
(2) Monitoring threat and aggressor satellite use and missions
(3) Providing Cyberwarfare assets and defenses
(4) Coordination with USN-SPAWAR, NOAA, and NASA
(5) Providing space visualizations to all Major Commands, especially to Engineering units.
AFSPC says about themselves:
AFSPC Vision
Global Access, Persistence and Awareness for the 21st Century
AFSPC Mission
Provide Resilient and Affordable Space and Cyberspace Capabilities for the Joint Force and the Nation
The USN has it's own "SPAWAR" -
USN-Space and Naval Warfare Command - sometimes abbreviated SPANWAR instead, but that version is deprecated.
Their mission? Provide C
4ISR support to USN assets, including satellites, IT, and comm gear. (C
4I = Command, Control, Computer, Communication, Intelligence, Surveilance, and Reconnaisance)
They say it thusly in their
brochure...
SPAWAR Mission
As the Navy’s Information Dominance systems command, SPAWAR develops, delivers and sustains command, control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR) capabilities for warfighters, keeping them connected anytime, anywhere. With a space support activity and two systems centers, and through partnerships with three program executive offices, SPAWAR provides the hardware and software needed to conduct Navy missions. The team consists of more than 9,700 active duty military and civil service professionals who keep SPAWAR at the forefront of research, engineering and acquisition to provide and sustain fleet capabilities.
The US Army has their own, too:
SMDC Space and Missile Defense Command.
Their mission statement:
USASMDC/ARSTRAT conducts space and missile defense operations and provides planning, integration, control and coordination of Army forces and capabilities in support of U.S. Strategic Command missions (strategic deterrence, integrated missile defense, and space operations); serves as the Army force modernization proponent for space, high altitude and global missile defense; serves as the Army operational integrator for global missile defense; and conducts mission-related research and development in support of Army Title 10 responsibilities.
Note that GPS is joint AFSPC and SPAWAR in practice - but a bunch of agencies actually send members to a GPS governing board. Most important: DOD and DOT.
There is no real unified plan because each service makes their own, except the Navy.
NASA, The USN, and the USAF all have specific plans in place in case of extraterrestrial threats. Since they are very low probability events, the piles of paperwork on them may be surprising... until you actually read some, and most of them involve Nukes from Orbit by other nations.
Note that discussion of whom they expected would be politics There are some, however....
I am personally aware that, in 1988, USAF had actual contingency plans in case of a hostile non-terran threat species contact. Publicly, the USAF has, since its inception, denied the existence of alien threats to the US. They've also denied the existence of crashed alien craft. And the B2, until it was spotted on news footage. And yet, just in case, they do have contingency plans for ET showing up.
USAMRIID maintains a contingency plan on an XT virus and XT bacteria... just in case. If anything, this is the most plausible XT threat not involving humans. especially considering Tardigrade survivability.
So, yes, there are plans. No, they're generally not public. Some are even hilarious. (Certain Lt.Colonels of my acquaintance should definitely have avoided drinks at lunch... they got stuuupid and showed me "Hey, can you believe what crossed my desk? You're a wargamer, you'll get a kick of of this...")