The 4786th Test Squadron was a US Air Force squadron stationed at Edwards Air Force Base, and was instrumental in the testing of the YF-12, a fighter version of the A-12, the precursor to the SR-71 Blackbird. The squadron was initially named YF-12/SR-71 Test Force in 1965, but was renamed to 4786th Test Squadron in 1970. This “MACH III” insignia was worn by members of the 4786th Test Squadron during this period.
Our t-shirts are made of 100% ring-spun cotton and is soft and comfy. The double stitching on the neckline and sleeves add more durability to what is sure to be a favorite!
• 100% ring-spun cotton
• Sport Grey is 90% ring-spun cotton, 10% polyester
• Dark Heather is 65% polyester, 35% cotton
• 4.5 oz/yd² (153 g/m²)
• Shoulder-to-shoulder taping
• Quarter-turned to avoid crease down the center
Our t-shirts are made of 100% ring-spun cotton and is soft and comfy. The double stitching on the neckline and sleeves add more durability to what is sure to be a favorite!
• 100% ring-spun cotton
• Sport Grey is 90% ring-spun cotton, 10% polyester
• Dark Heather is 65% polyester, 35% cotton
• 4.5 oz/yd² (153 g/m²)
• Shoulder-to-shoulder taping
• Quarter-turned to avoid crease down the center
Size guide
| LENGTH (inches) | WIDTH (inches) | |
| S | 28 | 18 |
| M | 29 | 20 |
| L | 30 | 22 |
| XL | 31 | 24 |
| 2XL | 32 | 26 |
| 3XL | 33 | 28 |