States will be less likely to challenge U.S. with excessive claims when it is backed by its ratification of UNCLOS
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The navigation and overflight freedoms we require through customary international law are better served by being a party to the Convention that codifies those freedoms. Being a party to the Convention is even more important because the trend among some coastal states is toward limiting historical navigational and overflight freedoms. Would-be adversaries, or nations that do not support the particular missions or activities we undertake, will be less likely to dispute our lawful use of the sea and air lanes if we are parties to the Convention. We support the Convention because it protects military mobility by codifying favorable transit rights in key international straits, archipelagic waters, and waters adjacent to coastal states where our forces must be able to operate freely.