I'm pretty sure you can. Posting it as officially associated with the website might cause problems, but as a simple reference pic posted on a forum board is legal.
BTW, SPI is pronounced "spy"? I always pronounced it "ess-pee-eye" Makes tons more sence as "spy," though, what with the camaflage, and the fact that "Semi-powered Infiltration" hardly makes any sense, so it was obviously used for the accronem (sp?).