There were no accurate maps of Libya at the beginning of World War II, so the L.R.D.G. surveyed and mapped the country while on operations.
L.R.D.G. navigators were so highly prized for their skills, that they were often lured away to other clandestine units such as the S.A.S.
The use of a wide variety of uniforms and cap badges in this movie is accurate, all of the men in the unit volunteered, and all used the uniforms they brought with them from their original units.
The movie's technical advisor is credited as "W.B. Kennedy Shaw". This was Captain, later Major, William Boyd Kennedy Shaw OBE, explorer, archaeologist, and founding member of the Long Range Desert Group (L.R.D.G.).
Brigadier Ralph Alger Bagnold, FRS, OBE was a professional soldier, desert explorer and the principal founder of the Long Rang Desert Group. His studies and publications on the action of the wind on sand formations are still considered to be the foremost authority in their field. Later, he became an advisor to NASA on the subject during their planet exploration programs.