These are military velcro patches issued for Friend or Foe identification. The flag is made of material that reflects when viewed under IR light.
IR reflective SLOVAK ARMY FLAG velcro patch - Biatec Gear - Professional Tactical Equipment
IR FLAG PATCH SOLAR RUSSIA US UK CANADA OR OTHER NESworkshop
Patches and Insignia
Chiefs of the Army Reserve - U.S. Army Reserve
Patches flag velcro Army surplus MILITARY RANGE
The Grand Union Flag – Texas 144.1, Flag Patches
IR United Kingdom Flag Patch, Foliage Green [Genuine Army Issue]
River Rocks Acrylic Print by Lynne Haines - Fine Art America, River Rocks For Painting
T96 - Tactical Mini Patches - USA Flag Reversed - 4-Pack Multi-Color
Reverse Flag Patch