The people who were interviewed for the series had to thoroughly rehearse their testimonies, because the interviews were recorded on expensive 35mm film stock, which had to be used in minimal quantities.
Six of the veterans who appeared in the series (Edward Spears, Horace Birks, Melvin Krulewitch, Douglas Wimberley, Robert Cotton Money and George Osborne Channer) reached the rank of Major General during their military careers.