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Beret flashes
Affixed to the cover is the Beret Flash for the Green Beret's assigned unit.

Grandpa Diaz saw combat as a Green Beret starting in the jungles of Vietnam and finishing in the arid deserts of Iraq. During his Special Forces career he served in the following SF Groups:

Beret insignia
Pinned to the beret flash is the Special Forces Distinctive Unit Insignia for Enlisted soldiers or the rank insignia for Officers.

Useful history
https://specialforcestraining.info/history/vietnam.htm

https://ut.ng.mil/ABOUT/Units/19th-Special-Forces-Group-Airborne/

https://tmd.texas.gov/texas-special-forces

https://apps.dtic.mil/sti/pdfs/ADA312864.pdf