[[1958]] - The ''USS Grayback first '' has its first operational launch of its "Regulus II " surface-to-surface missile off the California coast. :* The payload was consisted of mail (it was also the first US mail sent by guided missile).:* ''Not to be confused with the [[planet]], [[Regulus|Regulus II]]''
<noinclude>[[Category:On This Day|260]]</noinclude>