The cavalry's "glory days" lasted less than 100 years, tops (1830s/Westward Expansion - 1920/WWI). After that it was, "the horse they never rode, the line they never crossed". Giving armored, airmobile and attack helicopter formations "honorific" unit designations, and calling them "CAV" doesn't make them cavalry. The very word "cavalry" comes from the Latin for "horse". Absent horses, there is no "cavalry", except in the minds of some equestrian Luddites.