Avenger - Reg has seen, heard and been involved with many imperial atrocities, from being a medical responder treating the wounded of a peaceful protest when the empire opened fire on them on coruscant to hearing about the wookiees, a once proud and respected species in the galaxy, who were now a slave race, their sole purpose to build imperial weapons and ships. His worst fear is this same thing happening to his friends, his clan and his whole world of Tibrin.
Family/clan/world - Reg has heard of all the worlds and species that have been brought low by the imperial war machine and hopes his people will never be one of them, he fights for his family even though he never knew them as is the ishi tib way of life, he fights for his school (clan) and his world so it and others will never be enslaved and suffer as so many others have.
0 duty - personnel - he believes his purpose in the rebel alliance is to help and support those who do most of the fighting, also helping them out himself with his modest skill of blaster use. He seeks to help everyone he can and all who are his friends, so when the rebel alliance eventually topples the empire they can be there to experience the beauty and freedom of the new republic with him.