“USS Savannah (LCS 28) conducts a live-fire demonstration in the Eastern Pacific Ocean utilizing a containerized launching system that fired an SM-6 missile from the ship at a designated target. The exercise demonstrated the modularity and lethality of Littoral Combat Ships and the ability to successfully integrate a containerized weapons system to engage a surface target. The exercise will inform continued testing, evaluation and integration of containerized weapons systems on afloat platforms.” (I note this LCS, unlike Coast Guard cutters, has ballistic protection for the crews of its .50 caliber machine guns)
US Navy Littoral Combat Ship USS Savannah (LCS 28) successfully launched an SM-6 missile from a MK 70 Mod 1 Payload Delivery System placed on the ship’s helicopter deck.
This is significant for the Coast Guard, in that this could just as easily been a cutter. In fact, in some respects the cutters are better equipped than the LCS. It could give Coast Guard cutters a wartime role that would not require a lengthy refit in the yard, assuming the Navy could provide the expertise to augment the cutter’s crew with the necessary expertise.
There are other considerations that might be limiting, but the flight decks on the National Security Cutters are 50 by 80 feet and those of the Offshore Patrol Cutters will be a similar size, so there is sufficient deck space to host several 40x8x8 foot Mk70 containers, each with four cells each of which can contain up to four missiles (ESSM and possibly others).
In this particular exercise, an SM-6 was used against a surface target. The SM-6 was originally intended to be used for long range anti-air warfare (AAW) including terminal phase ballistic missile defense. but it also has a proven capability against surface targets, including an anti-ship capability.
The Mk70 can launch any of the weapons that can be launched from Mk41 vertical launch systems, meaning they can be used against ships, aircraft, submerged submarines, or targets on land.
The system could certainly be used on cutters acting alone to attack fixed facilities ashore. Already installed sensors might permit short range use against ships and aircraft.
But perhaps more importantly, there is concern for the depth of magazines on Aegis combatants and the difficulty of underway rearming. Cooperative Engagement Capability would allow missiles mounted in Mk70 launchers on cutters and/or other vessels to be launched by Aegis capable combatants against any threat they can target. This would allow relatively unsophisticated ships armed with the Mk70 systems to serve as offboard magazines for the Aegis combatants.
The Australians might also be looking at this for the Arafura class Offshore Patrol Vessels (OPVs) as well. In fact, it could be applied to virtually any allied OPV or ship with a flight deck more than 40 feet in length.
Chuck Hill's CG Blog 
We can also work on quickly giving allied ships our strike potential since we are short on ships. These launchers could drop onto Taiwan’s new, large cutters for instance.
Last I heard, the US Navy is much shorter on missiles than it is on ships. Without enough missiles to last the current US Navy ships more than a couple days of a war, the Navy doesn’t have enough missiles to put missile launchers on US Coast Guard ships, let alone ships of other nations. Missile launchers are useless when there are no missiles to fill them.
We could however add missiles much faster than we could add ships
It is also a question of getting the missiles where they are needed. Ships move slowly but the missiles and Mk70 launchers can be moved by air and be mounted on ships that are already in the area.
Missile production is being greatly ramped up.