Final answer:
Chapter 4 of R 350-1 covers NCOES, the Noncommissioned Officer Education System in the United States Army, which consists of three levels: Basic Leader Course (BLC), Advanced Leader Course (ALC), and Senior Leader Course (SLC).
Step-by-step explanation:
The chapter of R 350-1 that covers NCOES is Chapter 4, which is titled "Noncommissioned Officer Education System." The NCOES, or Noncommissioned Officer Education System, is a training program designed to provide professional military education to noncommissioned officers in the United States Army.
It consists of three levels: Basic Leader Course (BLC), Advanced Leader Course (ALC), and Senior Leader Course (SLC). Each level of the NCOES focuses on developing the leadership and technical skills of noncommissioned officers to prepare them for increased responsibilities within their ranks.