Lewiston firefighter Matt Wiers, third from left, shows Lewiston’s new air pack system to Auburn firefighters, left to right, Chris Washburn, Ryan Demers, Craig Bouchard, Dan Aceto and Mike Schadtle on “Red Shirt Friday” at Auburn Central Station. Demers approached fellow firefighters after a Boston firefighter introduced him to the nationwide practice of wearing red shirts on Friday in support of armed service members. Auburn began wearing their red shirts last November and Lewiston started at the end of January.