Work on an operational level was carried out jointly by the USA section of "OKH/Chi" and NAAS 5 at St. Germain. Early in 1944, NAAS 4 had been supplied with a group of cryptanalysts skilled in work on the M-209, and this small group competed with the section at "In 7/VI" in the quick solution of M-209 traffic. It estimated that 10%-20% of all M-209 messages intercepted were read by establishing the true settings of the wheels, and that about half of these settings were established at "OKH/Chi", half at NAAS 5. To insure speedy solution all subordinated to KONA 5 were ordered to teleprint to NAAS 5 all messages on the same settings or with Indicators differing only in the first two letters. Under the most favourable circumstances two days were needed to solve a depth, and two more days to reconstruct the absolute settings. There were times, however, when captured lists of keys or settings made possible a quick solution of the traffic. During the Allied invasion of Sicily and the Allied invasion of Italy, messages of great tactical value were decoded using captured booklets containing M-209 settings. At the time of the Normandy landings, the M-209 keys of the 82nd Airborne Division and 101st Airborne Division which covered the critical days of 6–11 June were captured and all traffic on those days was read.