I've read that this patch has something to do with the Royal Canadian Air Force, but what, I don't know.

 

The answer is here: 

 

The Shoulder Title shown would be for Royal Canadian Air Force personnel serving Overseas with British Royal Air Force. The Canada USA title indicates the Volunteer came from the USA. US personnel looking to serve with the RAF, had to join through recruitment in Canada. These badges are known as Nationality Shoulder Titles.

 

CDub

2 hours ago, Gunslinger said:

The Shoulder Title shown would be for Royal Canadian Air Force personnel serving Overseas with British Royal Air Force. The Canada USA title indicates the Volunteer came from the USA. US personnel looking to serve with the RAF, had to join through recruitment in Canada. These badges are known as Nationality Shoulder Titles.

 

CDub

 

 

Thanhs!