Hi GTB,
The bottom crest is the Ship's badge for HMCS Charlottetown, I think they wear it on their shipboard working dress now, but not 100% on that as I am not up to date on what our RCN is currently wearing.
Regret cannot assist on the other two, but I expect your theory of the ship being twinned with the Charlottetown FD may be accurate.
No idea on the 6 sided badge or if either might be worn.
B
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