Does wearing just one piece of a uniform equal being out of uniform?
Without knowing the full context of the situation, I'm going to make a reasonable assumption that due to the three people in this situation were military, that this occurred at an on-post gym. That said....
14–4. Occasions for wear
The PFU and the IPFU are authorized for wear on and off duty, on and off the installation, when authorized by the commander. Soldiers may wear all or part of the PFU or IPFU with civilian attire off the installation, when authorized by the commander.
AR 670-1 no where authorizes anyone to mix IPFU uniforms ON the installation.
Wear of military and civilian items.
(1) The wear of a combination of civilian and military clothing is prohibited, unless prescribed in this regulation or other authorization documents approved by HQDA.
So, even those post-level "blue books" have no authority to change the uniform guidelines unless they get HQDA approval.
Other key notes that AR 670-1 states...
In accordance with chapter 45, section 771, title 10, United States Code (10 USC 771), no person except a member of the U.S. Army may wear the uniform, or a distinctive part of the uniform of the U.S. Army unless otherwise authorized by law. Additionally, no person except a member of the U.S. Army may wear a uniform, any part of which is similar to a distinctive part of the U.S. Army uniform.
So, all those army wives wearing their husbands' uniforms are wrong.
I had never heard that bit from the USC 771... I've been told many times by many NCOs that folks CAN wear Uniform parts, just not the patches, but the excerpt you quoted CERTAINLY seems to say the opposite!!!
More so, I'm a stickler for the utmost professionalism - in and out of uniform, on or off post, on or off duty, and online or in person.
The way I see it, that citation means that there needs to be a written policy by your commander stating it is in fact authorized.
Again, this is merely my interpretation. However, every on-post gym has a written policy. It's simply best to cite that policy.
I'm not taking off at noon during that time unless I'm actually told I can do so.
It is important for all of us as leaders (even the E-4 and below types) to distinguish between what IS regulation, what IS unit policy/procedure, and what we think they SHOULD be...
That being said, on the spot corrections are best done with tact and consideration. Whether you are questioning a PV2 on mixing PTs with civvies or telling the 4-star that his flag is upside down, you can discreetly approach them to address the issue. This can save both of you a lot of embarrassment - them for not being called out in front of their fellow Soldiers, and you for not making an @$$ of yourself if you are WRONG!!!
He proceeded in telling me that he could wear it inside because it was "his building" which made little sense to me, but his confidence told me that at least HE though he was right.
Later, I asked around, and found out that he was, in fact, in charge of the DFAC, and that when you are WORKING in the DFAC, you are required to wear your headgear for sanitary reasons... which makes TOTAL SENSE!
Now If I had made that correction more publicly, I would have been humiliated, but as it was, only the CW4, myself, and a couple of other NCOs even know about the incident, and now I am a better-educated Soldier for the experience.
I agree about being professional so no one will get you into a situation where you feel the need to defend yourself, unless you are absolutely sure you are right and even then, pick your battles. As they say, "Is this the hill you want to die on?"

Uniforms
NCOs
Discipline
