My working hypothesis is that the first two letters define the numbering series, and subsequent ones modify the first two.
This is broken by DDGs and FFGs not falling into the DD and FF sequences, but otherwise it holds up reasonably well. Within submarines, there were the short-lived SC, SF...
27a
apollo program
cold war
cvs
drachinifel
great carrier reef
landingplatformhelicopter
lph
post-cold war
spacecraft recovery vessel
united states navy
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