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The M-16 and AR-15 are the same gun barring the full auto mechanism. Armalite originally made the AR-15, sold it to Colt, who pitched it to the military, and when it was adopted, was designated the M-16. (Simplified history) So while it may not have been standard issue as the AR, it’s been around for a very long time. Obviously it’s changed up a little over time as manufacturing has changed hands, but I’m not sure if it’s worth debating what’s in private hands other than how they’re designated when they’re essentially variants of the same gun.
Gotcha, they didn’t exactly go into the manufacturing history in boot when they trained us on how to use the thing, and I have had exactly 0 reasons to touch a firearm since boot.