Rich, the military never had the Mark 15.5 only the Mark 15, predessor to 
the 15.5, and the Mark 16 which is the same as the 15.5 but with 
different primary and secondary guages. Frankly, ther 15,5 primary and 
secondary gauges are better. The EX-19 project was (note past tense 
because the project was scrapped because the 16 is good enough) to 
produce a rebreather that was an order of magnitude higher tech than the 
Mark 16. The EX-19 concept had nothing to do with whether the Mark 16 or 
any predessors were not wonderful devices. I would be willing to bet, if 
the truth were known, that Bill Stone had Mark 15.5's for his early work 
and the Cis-Lunar evolved from that rebreather. You might even say that 
the Mark 15.5 is the foundation upon which the Cis-Lunar was designed. 
You know, biologists have known for a long time that if earthlings 
worshipped anything it ought to be the sun for providing the oxygen we 
breathe and the food we eat. In the same vein, rebreather fanciers ought 
to worship the MK 15.5 as the fountain of all rebreatherness and as such 
they ought to bow their heads when we MK15.5 owners pass by with our 
units. Rod 


On Thu, 1 Feb 1996, Richard Pyle wrote:

> George, answer me this:  If the Mk 15.5 is such a wonderful device, why 
> did the USN even start the EX-19 project?
> 
> Rich
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