*Nerd alert* - A Zulu strap can come in 2 different flavours, 3 ring which is as you describe - a single piece of nylon (or leather/whatever material) or a 5 ring, which has the extra section of strap to help secure the watch head should one spring bar fail. A Nato (G10) strap usually come with the extra section of strap (as the 5 ring Zulu) but in the RAF pattern Nato omits this extra section as is as a 3 ring Zulu! The major differences being that a Zulu has larger, oval shaped heavy duty hoops and strap keepers, where the Nato has smaller, rectangular keepers (or on the RAF pattern a fabric keeper). Nato's tend to be made of thinner material than Zulus to accosted the extra section of strap through the keepers.
Personally I like the RAF pattern Nato over the G10 pattern and I find the hardware on the Zulu a bit "clunky"
Clear as mud
Haha, clear as mud indeed!
Thank you for correcting me; looks like I've been in the wrong for the longest time!