Is it offensive to call service members brother and sister?

Using the term "brother" or "sister" as Vet has NOTHING to do with religion.
I honestly didn't use the term much while I was in. Now that I'm just a medically retired, broke-d**k vet, I do use it a lot more. On the outside, rank doesn't really matter as much (still cal CSMs by their rank & >LTCs, sir though). You connect with those who went through the same sh*t as you. Especially on the outside, Vets stick together & support each other; regardless of rank or branch. We use the terms "brother" or "sister" for those who get you, can relate to you & who would have your back; like family.

"We few. We happy few. We band of brothers. For he who sheds his blood with me this day, shall be my brother!"

P.S. Civilians suck! ....As does being one.

Only if you are married to them...I was going to make a comment about SSG V. Michelle Woods but I remembered how sensitive she was.

This is what I was referring to. I consider you all family.
http://youtu.be/VcMk85ZsBh0

Well, if it is, I guess I'm guilty. I always refer to other service members as my bothers and sisters in uniform.

The bond I have with those I deployed with is as close as my own immediate family. We trained together, lived together, ate together. Experienced events that changed our lives. Shared stories of our families and growing up. We learned to instinctively have each others back when the shit hit the fan and all hell was breaking loose. We grieve and suffered pain together as well as the joys and laughter.

We have our professional military careers. This is what the public sees and we share with them. Our military family - our bond that binds us is what we share between us. It is a bond we share with those who have served before us, serve with us and we will share with those who follow after us.

This bond is often unspoken. We look out for one another. Each of us have different experiences but we are not so different. We are brothers and sisters in the greatest profession of arms.

Nope, not at all and here is why. If I served or you served we are in fact brothers and sisters in Arms. We defended this country and we will always family to each other. I always knew I had their backs and they mine, and even though I have been out over 30 years, I would still feel that way today.

Attention: SFC Mark Merino
Perspective, use them or lose them.
This is what I personally say, my brothers and sister and my mother at what I call "1st Blood".
However my Armed Forces SM and Veterans are also brothers and sisters, in the sense that, if I put a topic here about what we know, we can all understand what I'm saying. In combat we would fight as a team together as one. Now how does that make us all family, well my biological family doesn't understand this, while my military family does.

You don't have to be in the Marines to really enjoy how they sing there cadence.

https://www.youtube.com/watch?v=h47n691fy3o

Never offensive!! I feel you are all, no matter the branch, my brothers and sisters

Honestly, I don't use it often, and not for anyone who wasn't in my company. My line of reasoning is that calling someone your brother is kind of a big deal, at least to me it is. If you're a fellow service member, we'll probably get along great and be good friends. But the only Marines I'll call my brothers were over in the sandbox with me, by my side a-hookin and a-jabbin with the Taliban. Feel free to disagree, but "brother" does not lightly leave my lips.

Of course not. We are all brothers and sisters-in-arms. We have seen both the best and worse sides of the human race. We have had to be there for each other during the good and the bad. We have celebrated together and we have mourned together. And regardless how some might act, they are still in the family. Every family has a bad egg or two; the military family is no different. And just like with your family, you don't have to talk to them but they are still part of the family regardless.