The LRDG weren't officially an elite unit, but a special forces unit that were quite effective. They did mostly recon but also with SAS I think made raids against axis airfields in North Africa shortly before second El Alamein.
Edit: yes, here's from wikipedia: "Stirling still managed to organise another assault against the German airfields at Aqedabia, Sirte and Agheila, this time [the SAS troops were] transported by the LRDG. They destroyed 61 enemy aircraft without a single casualty."
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