[Bookshelf]

With Pearl Harbor the battleship, which had a hayday of some forty years, was made obsolete.
This world is turning more rapidly month by month. The battle for Ukraine should provide myriad lessons to be learned; however, much of what I wrote previously should have been realized a decade ago.
Parenthetically, the Navy is sending ships less than ten years old to the graveyard because they are obsolete. And the Pentagon at this moment is trying to determine the future role of the U.S. Marine Corps. And the US airlines are hunting for pilots because the forces are not training as many pilots as they once did. In other words obsolescence in the military is everywhere apparent.

[BroJoeK]

Bookshelf: "Parenthetically, the Navy is sending ships less than ten years old to the graveyard because they are obsolete."

Naw... not "obsolete", the fact is LCSs never performed as advertised, and the issues suggested basic design & engineering misunderstandings.
To a non-engineer like myself the lessons learned include -- smaller incremental changes will be more likely to succeed than radical new designs.

Bookshelf: "In other words obsolescence in the military is everywhere apparent."

Sure, but that has **always** been true, military forces are always in a race to develop better weapons, tactics & logistics.
Sometimes change *appears* slower than at other times, but the only thing that really matters is we stay at least one step ahead of our potential enemies, so it's their rate of progress which must dictate our own.

Progress in one weapon system necessarily means potential obsolescence in older systems.