"Another Morning"

Recently, I was thinking about the mellotron brass phrase near the beginning of "Another Morning" (at ~0:24), and I realized something that I think I'd noticed a while ago but had forgotten about.

First, here's that phrase (I should note that I'm not entirely confident about my notation):

This phrase is just an arpeggiation of an A major chord (inverted so that - in ascending order - the notes are E A C# E), and this is a common feature of bugle calls.

For comparison, here's "Assembly":

and here's "First Call":

While both of these are in C major, they're made up of notes with the same sort of arpeggiation (G C E G).

I don't think the mellotron brass phrase in "Another Morning" is an actual bugle call, but it's certainly characteristic of one.