Which rank corresponds to the chevron with four stripes and a star in the center?

The rank that corresponds to the chevron with four stripes and a star in the center is indeed the Staff Sergeant. In the U.S. Air Force, the Staff Sergeant is a non-commissioned officer rank, typically denoted by four downward-facing stripes and a single star in the center of the insignia. This visual representation signifies leadership and experience within that rank.

Confirming this designation involves understanding the hierarchy of ranks. The 2nd Lieutenant and 1st Lieutenant are both commissioned officer ranks and do not feature the same stripe and star insignia. The Chief Master Sergeant rank, which is a higher enlisted rank, is represented by a different insignia featuring a unique arrangement of stripes and the eagle and star emblem, rather than just four stripes with a star. This distinction is important to grasp as you study the rank structure within the Air Force.