Is it offensive to call service members brother and sister?

SFC Mark Merino I consider you my brother. Are you offended?

Absolutely. "...for he who sheds his blood with me this day, shall be my brother."

No I consider those people whom I had the brief privilege to have served with to be my brothers and sisters.

"We few, we happy few, we band of brothers. For he today that sheds his
blood with me, Shall be my brother; be ne'er so vile, This day shall gentle
his condition. And gentlemen in England now abed, Shall think themselves
accursed they were not here, And hold their manhood's cheap whiles any
speaks, That fought with us upon Saint Crispin's day."
- William Shakespeare ("King Henry V")

If I have come to know the person and they have taken the time to know me, I don't mind it. Now, someone who bumps into me in a bar or on the street and notices the hat and seems to use it to ingratiate themselves, yeah that bothers me and I find that half of them are full of it. They also seem to use that Hollywood "The Nam" that I so despise. Any thing that has thumped your life that hard deserves the respect of its full name. Just as the VC/NVA were referred To as Mr. Charles when his shit was particularly together. So when it is done correctly I don't find it offensive but a sign of shared experience and pain.

In no way is the term brother nor sister offensive, unless you mean it in a Cain and Able sort of way. Or of course the way SSG V. Michelle Woods thought up.

Not at all. Where do you think the term "Brothers and Sisters at arms," people only get offended if there is nothing for them to occupy their time on that is more productive. That's just my thought on it.

Not at all. I consider all of you my brother or sister.

Absolutely!!! I Do It EVERY DAY - We are brothers and sisters IN arm, and UNDER arms!

I must say I agree with the majority of others on this post. It truly depends on the situation, I know, while I am dealing with one of the soldiers at my unit, if it has to do with work, or the Army in general, it is by rank and name. However, I do see him at times outside of work, and at times am offering some life advice about certain things that are going on with him. The situation depends on how I refer to him, whether it is Brother (never bro, bruh, brah, etc.), or by rank and name.

I don't think it's offensive. I never used it until I retired and realized the military still considers me one of you. I'm part of the military family and in that regard brother and sister isn't offensive.