One of twelve photographs showing the construction of a roadblock, checkpoints, patrol and the aftermath of an explosion, Northern Ireland, 1970s. From a collection of photographs assembled for use in Col Robin McNish's Iron Division - The History of the 3rd Division, depicting the 3rd Division, 1918-1977. After the Suez Crisis of 1956 showed the need for more rapid mobilisation, the 3rd Division pioneered the concept of air portability in the late 1950s and 1960s. Associated with Northern Ireland (1969-2007).