Legionnaire Games has a free demo of their Strike Legion: Platoon Leader over on Wargame Vault. Why not check it out?
From the update:
Legionnaire Games has released a free preview of their upcoming Strike Legion: Platoon Leader 15mm SciFi minis rulebook.This preview/demo version includes the introduction and Basic Infantry Combat sections of the complete rulebook, along with a trial scenario and everything needed to play through it using your miniatures.
The complete rulebook will be available mid-May for $12.50 (PDF); the print edition will be available mid-June ($TBA).