Given the following context:

Motivated by a variety of reasons from college tuition support, to a sense of purpose, best friends Dominic and Cole join the Army National Guard after graduating from their rural high school.  After persuading several of their friends to join them, the young men are sent to Afghanistan as part of the 107th Engineer Battalion, 168th Engineer Brigade, where they are tasked with searching for roadside bombs in order to keep roads safe for other troops.  By the time their deployment ends, they are no longer the carefree group of friends they were before enlisting; repeated bombs blasts around their convoys have led to TBI symptoms, and they have become increasingly disillusioned about their mission.
Coming home is no relief as they are now confronted with the silent war wounds of PTSD and TBI. The soldiers struggle with reintegration with society and some miss the simplicity in life they had while in Afghanistan. The latter half of the documentary focuses on their struggles on the home front and how each of them, and their families try to return to normal life.

answer the following question:

Who is tasked with searching for roadside bombs? 

Dominic