"Chief (last name)" within their units regardless of rank. Enlisted personnel Sergeants and corporals are referred to as NCOs, short for non-commissioned officers. This distinguishes corporals from the more numerous specialists who have the same pay grade but do not exercise leadership responsibilities. Beginning in 2021, all corporals will be required to conduct structured self-development for the NCO ranks, completing the basic leader course (BLC), or else be laterally assigned as specialists. Specialists who have completed BLC and who have been recommended for promotion will be permitted to wear corporal rank before their recommended promotion as NCOs. Privates and privates first class (E3) are addressed as "Private (last name)", specialists as "Specialist (last name)", corporals as "Corporal (last name)" and sergeants, staff sergeants, sergeants first class and master sergeants all as "Sergeant (last name)". First sergeants are addressed as "First Sergeant (last name)" and sergeants major and command sergeants major are addressed as "Sergeant Major (last name)". Training Training in the U.S. Army is generally divided into two categories – individual and collective. Because of COVID-19 precautions, the first two weeks of basic training — not including processing and out-processing – incorporate social distancing and indoor desk-oriented training. Once the recruits have tested negative for COVID-19 for two weeks, the remaining 8 weeks follow the traditional activities for most recruits, followed by Advanced Individualized Training (AIT) where they receive training for their military occupational specialties (MOS). Some individual's MOSs range anywhere from 14 to 20 weeks of One Station Unit Training (OSUT), which combines Basic Training and AIT. The length of AIT school varies by the MOS. The length of time spent in AIT depends on the MOS of the soldier. Certain highly technical MOS training requires many months (e.g., foreign language translators). Depending on the needs of the army, Basic Combat Training for combat arms soldiers is conducted at a number of locations, but two of the longest-running are the Armor School and the Infantry School, both at Fort Benning, Georgia. Sergeant Major of the Army Dailey notes that an infantrymen's pilot program for One Station Unit Training (OSUT) extends 8 weeks beyond Basic Training and AIT, to 22 weeks. The pilot, designed to boost infantry readiness ended in December 2018. The new Infantry OSUT covered the M240 machine gun as well as the M249 squad automatic weapon. The redesigned Infantry OSUT started in 2019. Depending on the result