"Royal Air Force Army C-operation Command, 1940-1943." Pilots of No. 400 Squadron RCAF run to their Westland Lysander Mark IIIs at Odiham, Hampshire, during an Army cooperation exercise, after having received their flying orders from an Army Liaison Officer (left, foreground). The ALO will monitor the sortie through his wireless operator, working the VHF transmitter/receiver set next to him.