Hi Stephen,
The military term MSE normally refers to a Mobile Subscriber Equipment. The military's tactical phone system. See also :
http://www.fas.org/man/dod-101/army/.../11066L400.htm
It is also used as abbrev. for materiel status evaluation; missile support element. In strictly military terms MSG would mean master sergeant...
MSE is also a term used in the USAF : Maintenance scheduling effectiveness
Doesn't seem logic either...
MSE is also used in civilian as for a Master of Science in Engineering or Epidemiology or Education. The first one seems interesting.
Just a wild guess...
Best from Johan