Hello Mindbender,
here are the links to the UK and US strap specs:
MoD: http://www.dstan.mod.uk/data/66/047/00000200.pdf
DoD: http://assist.daps.dla.mil/docimages/00 ... /25409.PD2
I have several so-called "beefy" US military straps in 20mm and 22mm which are extra long and made of a quite substantial thick fabric (in the Rhino class, actually). They wear extremely well, and complement a lighter watch as well as the Waterborne or Rhino are a perfect fit for a heavier watch.
The regular (non-beefy) straps are a totally different matter.
Best regards,
Crusader