Possible Clues:

• Religious warriors that may be represented as manly aviators
• Shaw's Major Barbara wore its uniform
• Christian organisation with brass bands
• Worshipful band of the free?
• Charitable group
• Manly aviators flying for a charitable organisation
• Many travail, so may be converted to religious group
• The Booths' creation
• May no travails disrupt those helping the homeless at Christmas!
• Organisation founded by William Booth