This flag belongs to...
The French Foreign Legion
Amnesty International
Doctors Without Borders
The Salvation Army
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. 
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Answers by country
The French Foreign Legion
Amnesty International
Doctors Without Borders
The Salvation Army
answers
 Republic of Ireland
Republic of Ireland14
 Germany
Germany48
 Australia
Australia29
 Greece
Greece24
 the Netherlands
the Netherlands12
 Canada
Canada11
 the United Kingdom
the United Kingdom76
 France
France12
 Poland
Poland2650
 the United States
the United States88
 the Philippines
the Philippines12
 Romania
Romania10
 India
India47