Also, sorry funfungiguy, I forgot to answer your question.
Martial artist is listed as ANY 1 -I, INF 1 -V, ST 4:III, AG 4:III.
This means that Infiltrators and Tekkers can take it at first level, but only up to rank I. Frontliners can take it at first level all the way,eventually, to rank V. If you're not a frontliner, you have the possibility to take it to rank III it you have a strength or agility at least at 4.