I have seen Salvation Army church members going to church in white uniforms. Here is a sample image (source).
What is the role of uniforms in the Salvation Army?
Is it compulsory for them to wear uniforms in the church?
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As a Soldier of The Salvation Army, I wear my uniform, in the same way others might wear a cross around their neck or something, the uniform identifies the wearer as a soldier of The Salvation Army, but more importantly as a Christian.
This excerpt from the New Zealand. Fiji, Tonga Website answers the questions "Does a soldier have to wear the uniform, and why?"
Today, not all Salvationists wear uniforms—it has become a personal choice. But the reasons for wearing a uniform are unchanged—to show a commitment to a war against evil; a personal testimony to the wearer's own Christian faith and practice; and to signify to those in need that the wearer is available to help or listen.
This is an old thread but I just found it. As a Salvation Army Soldier who feels called into officership I want to answer this. The SA (Salvation Army) does not do water baptisms, nor do they partake of communion (another story for another time) But we do have the Uniform. The uniform is an outward statement of an inward change much like Baptisms.
It tells the onlooker that the person wearing uniform is a professing Christian and that he or she is available to give practical or spiritual help through the Movement, if not personally. Uniform also opens the way for the wearer to be recognized and accepted as the representative of The Salvation Army in all kinds of situations. There are also personal advantages in uniform-wearing. It helps the wearer to remember to live up to the Christian profession he or she has made. In difficult or dangerous situations the uniform can give the wearer a measure of protection. Wearing uniform also gives Salvationists a feeling of fellowship when they meet. I remember every moment I wear my uniform that I represent the covenant that I signed as a soldier to live a christian life and live HAND TO MAN AND HEART TO GOD.