Without diving down deep in to corollary army regulations, all that I can discern is that a CO ‘may’ find a soldier ‘out of uniform’ for failing to display a decoration on their Class A uniform...if the wearing of such a decoration was mandated (the language on most all awards is ‘may display’).
https://armypubs.army.mil/epubs/DR_pubs/DR_a/pdf/web/ARN18147_R600_8_22_admin2_FINAL.pdf
If you find something new, I’d be interested as well.
I’d be hard pressed to find that award worthy of being on my uniform
This is the nub of it where a failure to display the award on the uniform when taking the official photograph that goes in the personnel jacket when being considered for promotion is taken into account negatively by the promotion board.