Looking at the AOS signs decals..got me wondering:



All the red over blue (Artillery) AOS markings provided comprise 3-digit numbers, 172-175. That means they are for 1st Cdn Army, and should have a white bar underneath. Not only that, but it means if you intend on pairing them with the sheet pictured in the news article, you can only use a few of the Formation Signs (and will still need to add the white bar)

Like this (edit - the white bar is not going to show on the white background here):

In fact, none of the AOS signs can be used with 1,2,3,4,5 Canadian Division Formation signs, which make up around 30% of that sheet.

And as none of the AOS signs have the white bar on top, then it becomes problematic using them with 1st or 2nd Canadian Corps Formation markings.
Corps Formation:

Should have white bar on the top of AOS:

The Signal Corps markings (white over blue with red numbers) which belong to 1 Cdn Army are supposed to have a red bar on the bottom, not a white one.

I'm sure there's still usefullness in the sheets, but a lot of the AOS markings simply cannot be paired with the other sheet of Formation signs.

These would be for the 1st Canadian Armoured Brigade: Ontario Regiment, Three Rivers Regiment, Calgary Regiment

This type would be useful for Corp and Divisional RSASC units, as they did not have the white bar at the bottom

Archer's web page states the sheets may have deliberate mistakes to prevent copyright violations...

Quoted Text

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These would be for the 1st Canadian Armoured Brigade: Ontario Regiment, Three Rivers Regiment, Calgary Regiment.

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Not following you here - are you saying the red over blue ones are for 1 CAT Bde? Some of the AOS numbers jive with 1 Cdn Army, ie 174 is 191 Fd Regt RA, and 175 is 5 Med Regt RCA.

But is there some documentation where a non-Canadian can find a reliable explanation about how to use which sign where and in a right combination?