at this site in program archives we see the mention of Mach...

at this site in program archives we see the mention of Mach 5/50

http://www.darpa.mil/sto/smallunitops/

Now, it interested me simply because all other programs could be opened for perusal, however, unable to do so with Mach 5/50

So I sent off three emails to DARPA to enquire why. First two emails no reply. The third one was answered and I thought it may be of interest here.

DARPAs' reply:

There is no MACH 5/50 web page as there is no publically released information available on the program at this time. The listing is just a reference to an archived program that was associated with that thrust area.