This booklet was donated by Capt Laurie Dawson (18615) who was with the Royal Australian Corps of Signals. He Served in Vietnam with 557 Signal Troop from Apr 67 to Jun 67, 110 Signal Squadron from Jun 67 to Sep 67, 561 Signal Troop from Sep 67 to Nov 67 and 110 Signal Squadron from Nov 67 to Mar 68.A dark blue plastic cover with white information on the front. Under the Royal Australian Corps of Signals are the details of the booklet. The booklet is held together with a metal spiral inside the cover. On the inside of the booklet reads 18615 Capt L.B. Dawson, System Planning Tp, 2 Sig Regt 30 Apr 69.booklet, royal australian corps of signals, reference manual, capt laurie dawson, lt laurie dawson, 18615, 557 signal troop, 110 signal squadron, 561 signal troop