I don’t feel like writing today.
The US Navy in the early 1990s was greatly concerned with small boat swarming attacks on US surface ships, and looked at ways to counter them. A couple of different weapons were used. First, ships in areas likely to face such swarm attacks (that is, in the Persian Gulf) were quickly equipped with .50cal machine gun mounts. But the .50cal is not terribly accurate, nor particularly lethal.
A more advanced approach was to modify the 20mm Phalanx Close In Weapon System giving it the capability to engage not just missiles, but also surface targets.
A third option was to bolt on mounts of automatic cannons. In the end, that’s what happened, with the 25mm M242 Bushmaster cannon on the Mk38 mount.
Mk38 Mod 1 Mount for M242 25mm gun.
For years, the mounts were swapped in and out as ships entered and departed the 5th Fleet Area of Operations. Originally little more than a pedestal mount, todays Mk38Mod2 mount is a remotely operated, stabilized mount with day and night capability.
Mk38 Mod 2 Mount
Part of the decision making process (but only part) of what gun to mount included studies of the terminal effects of the various cannon rounds and ammunitions available. And that’s were this video comes in.
Damn shame to see the MkIII PB getting shot up. It would have been nice to see that up for surplus sale.