Private (PV1)
Enlisted ranks with E-1 to E-4 pay grades are classified as junior enlisted. Soldiers in those ranks are automatically promoted based on their time in service (TIS) and time in grade (TIG).
Private (PV1) is the lowest rank in the U.S. Army and is primarily for recruits in basic combat training (BCT). They're typically automatically promoted to private second class after six months of TIS. However, soldiers may be demoted to private as part of disciplinary action [Indeed].
The U.S. Army uses private for the two lowest enlisted ranks, just below private first class (E-3) or PFC. The lowest rank is "Private (E-1)" or PV1, sometimes referred to as recruit, but also held by some soldiers after punishment through the Uniform Code of Military Justice or prisoners after conviction until they are discharged. A PV1 wears no uniform rank insignia; since the advent of the Army Combat Uniform (ACU), the term "fuzzy" has come into vogue, referring to the blank velcro patch on the ACU where the rank would normally be placed. The second rank, "Private (E-2)" or PV2, wears a single chevron, known colloquially as "mosquito wings" [Fandom].
BCT, also known as “initial entry training,” has three phases and lasts about 10 weeks, depending on your assigned jobs, known as military occupational specialties (MOS). While the Army has about 190 MOSs, they typically are divided by participation in combat missions or jobs that support soldiers in those combat roles [Indeed].
https://www.indeed.com/career-advice/finding-a-job/army-enlisted-ranks
https://the-green-berets.fandom.com/wiki/Private
https://www.indeed.com/career-advice/starting-new-job/army-basic-training