Don't expect Marine Units to be displaced off Amphibs so that Army units can perform the mission. That leaves the JHSV's to deliver Stryker Brigades to the places where they'll be used.
via Naval Recognition.
The 103 metre (338 foot) long aluminium catamarans are designed to be fast, flexible and maneuverable even in shallow waters, making them ideal for transporting troops and equipment quickly within a theater of operations. The ship has the ability to support a variety of operations, supporting the warfighter through traditional logistics missions, humanitarian support projects, disaster response or by supporting maritime law enforcement activities.If the Army remains Stryker centric in its operations in the Pacific then these ships are a must.