Specialist is a military rank in some countries’ armed forces. Two branches of the United States Armed Forces use the rank. It is one of the four junior enlisted ranks in the United States Army, above private (PVT), private (PV2), and private first class and is equivalent in pay grade to corporal; in the United States Space Force, four grades of specialist comprise the four junior enlisted ranks below the rank of sergeant. Denmark Regular forces In the Royal Danish Navy and Royal Danish Air Force, the rank of specialist is branch-specific; "Naval specialist" and "Air force specialist" () respectively. The ranks are placed below corporal and above private first class (). They are rated OR-3 within NATO and the rank has the grade of M112 within the Ministry of Defence's pay structure. Home guard In 2018, new specialist ranks were introduced to the Danish Home Guard. These new ranks were created to remove the need for leadership training at the lower ranks, as the selected functions no longer require actual leadership. Taiwan Specialist ( shàngděngbīng, "upper-rank soldier") is a rank in the Republic of China Army next to the rank of corporal, and has the NATO equivalent code of OR-3. United States United States Army Trades and specialties (1902–1920) In 1920, the Army rank and pay system received a major overhaul. All enlisted and non-commissioned ranks were reduced from 128 different insignias and several pay grades to only seven rank insignias and seven pay grades, which were numbered in seniority from seventh grade (lowest) to first grade (highest). The second grade had two rank titles: first sergeant, which was three stripes, two rockers, and a lozenge (diamond) in the middle; and technical sergeant, which was three stripes and two rockers. By World War II, the rank of first sergeant had been elevated to first grade and a third rocker was added, with the lozenge in the center to distinguish it from master sergeant. The wearing of specialist badges inset in rank insignia was abolished, and a generic system of chevrons and arcs replaced them. Private/specialist (1920–1942) From 1920 to 1942, there was a rating (not a rank) for men of the sixth and seventh grades designated "private first class, specialist", or "private, specialist," that was graded in six classes (the lowest being sixth class and the highest being first class). They were considered the equal of a private first