Until fairly recently, there were a number of Salvation Army bands that had no female players, either because of a (rather dubious) policy decision, or because no women had wanted to join. For whatever reason, other churches have often looked with envy at the Army because the bands did/do attract/keep a group of men involved with church activities, when many churches have a predominance of female parishioners. When church growth principles are applied, the band would be seen not specifically as a musical organisation, but rather as a fellowship group, and a group of 20 or 30 men in a church would be a source of envy to many congregations.
I think it is probably true to say that, even now, there is a smaller proportion of women active in SA banding, but that may well be due, at least in part, to other church activities that they may be involved in. Once child care arrangements are taken into account, it may not be possible, for example, for both husband and wife to be out at practice on the same night, so it may be that one will play in the band whilst the other jin the songsters (choir).
I think it is a shame that, in the past, some players were excluded from participation in banding on grounds of their gender, and I am glad to see things are changing.