This flag belongs to...
The French Foreign Legion
The Salvation Army (TSA) is a Protestant Christian church and an international charitable organisation. The organisation reports a worldwide membership of over 1.7 million, consisting of soldiers, officers and adherents collectively known as Salvationists. Its founders sought to bring salvation to the poor, destitute, and hungry by meeting both their "physical and spiritual needs". It is present in 131 countries, running charity shops, operating shelters for the homeless and disaster relief and humanitarian aid to developing countries.