Lightweight Portable Security (LPS) creates a secure end node from trusted media on almost any Intel-based computer (PC or Mac).
To get started, download the LPS-Public ISO image and burn it to a CD. Read the Quick Start Guide for more information.

http://spi.dod.mil/docs/LPS-1.2.2_public.iso
http://spi.dod.mil/docs/lps_quick_start.pdf