The core exhibition of the Museum of Field Ordinance is devoted to the army chaplains. Visitors can watch multimedia presentations which tell the story of the cathedral and the chaplains themselves. Mid-17th-century handicraft, field altars, uniforms, liturgical vestments used by army priests as well as documents and photographs are on display.
In its collection, the Museum also has First Field Military Ordinariate Stanisław Gall’s pastoral staff. The staff was funded by the military clergy in 1918. The collection also boasts the mitre and pontifical gloves of Bishop Józef Gawlina.
A space devoted to the chaplains who died in the plane crash near Smoleńsk on 10 April 2010 is located in the cathedral’s basement.