I have seen triangular flag frames used for memorial flags, but can they also be used to display non-memorial flags?

I have the flag that I was given upon my retirement in a triangular frame.

I have a Flag in a triangular frame with a brass plate with My name, service dates etc. that was presented to Me on My retirement from the U.S. Air Force With that presentation was a certification that flag had been flown over the US Capitol.

The Flag when properly folded is a triangle. What other shape case would make any sense? You could just display it folded inside a larger display case with other items, but then you'd have the problem of how to fix it in position. Considering the emotion the Flag evokes in many folks, some would believe you perhaps desecrated it by how you affixed it.

I found a good amount on this topic, but tried to post a credible source of information. I think this seems to be a good source of information on displaying, folding and the reasons to use the cases. http://www.memorials.com/Flag-Cases-Flag-Etiquette-information.php

Check this site out: https://www.flagcases.net/

Thanks for the thoughts and sources on this subject everyone! I was hitting dead-ends in my search for info, but I figured there would be those with first hand knowledge or better sources than I.

I received a flag that was flown over the capital on the last day of my last drill weekend, that capped the end of my AD & Reserve time in uniform, and I figured a good way to display it would be in a shadowbox frame, but wouldn't want the mistaken impression it was a memorial flag.

So now I know; and as G.I. Joe told every kid back in the 1980s, "knowing is half the battle".

At my retirement, I was presented with a shadow box with a lot of items in it, but the one that means the most was the US flag that was flown over my last command in my honor the day before I retired! It is correctly folded and in a triangle frame within the shadow box with a brass plate describing what it represents.. The only other flag I have in a triangle case is the flag that covered my father's casket. He was a Gunners mate in WWII.