- 100% comfortSoft cotton
- Double-needle stitching throughout
- Coverseamed neck with lay flat collar
- Tag-free neck label
- Shoulder-to-shoulder tape
- Comfortable rib knit cuffs
- Sport Grey is 99% cotton, 1% polyester; Light Steel is 90% cotton, 10% polyester
The 3rd Radio Researchd Unit (Detachment) were among the earliest U.S. military advisors in Vietnam;
3rd RRU later grew to become the 509th Radio Research Group
These occupations, which required a top secret clearance with Special Intelligence/crypto special clearances,
were essential to U.S. Cold War efforts. ASA units usually operated in four groups using revolving shifts to provide
coverage twenty-four hours a day, seven days a week.