"Steven P. McNicoll" wrote...

MTRs are established for the sole purpose of military training at airspeeds
greater than 250 KIAS.

According to a couple FAA and USAF sources, that is true for IR and VR routes,
but not SR routes...

From the Montgomery County AFSS web site at
http://www.cxoafss.jccbi.gov/Military.htm, as well as the Buffalo AFSS site at
http://www1.faa.gov/ats/bufafss/flig.../military.htm:

SR (slow speed low altitude routes) - conducted VFR below 1,500 feet at 250
knots or less, without prior notice.

From the Acronym list at http://www.afranges.net/Chapters/appendixes.pdf and
Edwards AFB at http://www.edwards.af.mil/pim/PUBS/t...-1/atch7a.doc:

SR Slow Speed Low Altitude Training Routes

From the Dover AFB Mid-Air Collision Avoidance handbook at
http://public.dover.amc.af.mil/org/w...Printable.pdf:

Only VR routes are depicted on sectional charts. SR and IR Routes are not
shown!