In many classic wind band pieces, there are parts written for Db piccolo and Eb horn. I imagine these were more common in the genesis of the military band, but now Db piccolo is all but unheard of, and you'd be hard-pressed to find a horn in Eb. (There is a cousin of the baritone horn called the alto horn which is pitched in Eb, but I am fairly certain this is not what is being referred to.)
When did wind band instrumentation make this transition?
Is this standard outside the US? Are there wind bands in other countries that do still use either of these instruments?