Navy “call sign” patch, Devgru - SEAL

[digi-shots]

I was searching online and came across this listing for a NSWDG Devgru “call sign” patch.

 

I have a similar one and have wondered what it is.  What are they and how are they used?

 

Do these letters refer to a particular person or operation?

 

Thanks!

[digi-shots]

BTT

 

[markie916]

I guess no one knows Digi. My guess for what its worth is that the call sign is assigned to a person, at least for a time. I've seen photos of troopers and they have the same call sign. So either the pics were taken on the same operation or they have a callsign for maybe a particular deployment? How would you remember if the calls signs kept changing? Cheers Mark.

[digi-shots]

Thought someone might know...