Yes, they are short for "mobilization" and "demobilization", but I think an explanation of the terms is necessary.

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Note added at 1 hr (2007-04-22 13:27:02 GMT)
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Definitions on the Web: mobilization

Process of activating resources including personnel, equipment and supplies. The process would include notification, reporting, and setup to attain full or partial readiness to initiate response and recovery actions.
www1.va.gov/emshg/apps/emp/emp/definitions.htm

Demobilization:

The processing of apparatus and/or personnel for release or reassignment to another incident. Normally occurs at base or at a demobilization center.
www.ocfa.org/innerpage/glossary.htm

So I now think that this means the entire process of making the equipment ready for use or taking it out of use, whereas assembly and dismantling (disassembly) is only that part of the process involving the actual physical components of the machinery.

Thanks to Clare Barnes for causing me to do this extra research.