senior cadets of each of the six companies, and two appointments of "battalion senior under officer" and "battalion junior under officer". New Zealand Under Officer was also a rank in the New Zealand Air Training Corps and the New Zealand Cadet Corps. In 2012 the rank was bought into the New Zealand Sea Cadet Corps, which replaced Master Cadet. It ranks between cadet warrant officer and ensign NZCF pilot officer NZCF or second lieutenant NZCF, thus making it the highest rank a cadet can reach, although not actually itself a cadet rank. Under officers are normally aged between 17 and 21, and to be eligible for a commission one must be at least 20 years of age. Under officers are cadets who have received the necessary training and have the desire to become NZCF officers. Hence, under officers are treated as understudy officers. There are two under officers' courses run each year, and provide the training that under officers require to be efficient understudy officers within their cadet units, and skills which will be useful as a commissioned officer. They perform roles similar to commissioned officers, but do not have nearly the same legal responsibilities and are not to be saluted, but are referred to as "Sir/Ma'am". Cadet under officers wear insignia similar to that worn by officer cadets, except that the thin blue braid is replaced by a piece of NCO chevron cloth. This emphasises their official status as cadets rather than adult leaders. The abbreviation for the rank of Under Officer is UO for all three corps. To become an under officer, cadets are required to: Spend 6 months at the minimum rank of staff sergeant/flight sergeant Have completed at least 3 years of Cadet Forces training Have successfully completed SNCO course Be at least 17 years of age Have the desire, commitment & potential to become an NZCF officer Be recommended by their unit commander and have the approval of AC CFTSU. One of the more commonly used locations for the Under Officer course was the Royal New Zealand Police College, located in Porirua. This location presented the unique opportunity for NZCF students and staff to interact with the New Zealand Police and interact with their equipment. The last RNZPC course was held between 20 and 29 January 2017. The Last Under Officer Course was held at RNZAF Woodbourne between 6 July and 15 July 2018. Consultation