From the Muv-luv Wiki:

First Lieutenant in the UN Army, Commanding Officer of Idar Test Flight, Jerzy Sandek is a Polish-born TSF pilot who oversees the Soviet Union's contribution to Project PROMINENCE. Given his background in the Soviet Forces, Sandek served as a Liaison Officer with Soviet forces for Bao-Feng and Argos Flights during their deployment to the Kamchatka peninsula for live-fire excercises.