|There is more information available on this subject at Skyhook on the English Wikipedia.|
Skyhooks are platforms anchored in a low-planetary orbit, in order to move people and items quicker and easier into space. Earth and its moon Luna have a number of military defense complexes, which helped in the defense against the Covenant's attack on Earth in 2552. The Office of Naval Intelligence sent security personnel equipped with Air Assault and Orbital Mjolnir Armor to protect these facilities against the Covenant's assault.
- Halo 4 (Mentioned only)