Weapons in low earth orbit pose a potential threat to all surface forces. A well-planned strike by such weapons could result in a sudden and dramatic shift of world sea power away from the US.
Threats that come from unexpected directions are the most dangerous. Will sea power always require warships—or will some nation contest control of the world's oceans using an orbital, non-nuclear, weapon system that could destroy a large number of ships, worldwide, within a few days (or even hours)? A well-planned strike could result in a sudden and dramatic shift of world sea power away from the United States and to a nation unfriendly to the Western democracies.
For the past 50 years, the U.S. Navy has been the unquestioned world sea power. Indeed, the strategic, operational, and tactical war doctrine of the Western democracies assumes such control. The tactics and equipment needed for littoral warfare and power projection are the main concern of the U.S. Navy today because no other navy seems capable of contesting it for control of the seas.