To settle the "TEMPEST SE/30" debate, here are picture of the actual SE/30 system modified by Candes Systems Inc. for the US Government to TEMPEST specifications:

http://www.digibarn.com/collections/systems/mac1891T/

http://www.digibarn.com/collections/systems/mac1891T/candes-pix/page_01.htm

Very much a non-standard SE/30, but they did keep to the original beige color scheme.

In keeping with the theme of the thread, Candes System Inc. also made a TEMPEST Plus:

http://online.sfsu.edu/hl/c.Tempest.Mac.html