Horizon was militarization of the moon (see notables).

https://www.state.gov/t/isn/5181.htm

Yet we had an agreement with the USSR not to do so. Now that China (and India, et al) are in the space game, I'd say this has been dropped.

The USSR/US space disarmament has a deep-state feel to it, anyway. I never understood it when I first heard about it. Again, remember POTUS and his "Space Force" comments.