Environmental Support · Merged into 3E4X1, effective October 1, 1992
One row per changing predecessor in the explicit two-to-one merger; source pattern preserved. Verified source wording: “In October 1992, the 552X5 (Plumbing), and the 566X1 (Environmental Support) merged to form the present 3E4X1 Utilities System career field.”
Sources
- Utilities Systems. AFSC 3E4X1. (Internet Archive full-text OCR around char offset 9,216; governing lineage context verified)