SCU study (Hancock, Porritt, Grosvenor, Cates, January 2024) analyzed 505 UAP incidents 1945-1975 across nine behavioral categories: interactive flight, radical flight, electronic transmissions, weapons interference, military installation intrusions, loitering, close approaches, occupant observed, occupant encounters. Dramatic behavioral shift confirmed: (1) 1947-1952: ~80% interactive/radical flight — visible formation displays, mostly daytime, paced military and civilian aircraft. Example: July 1 1948, 12 oval discs ~100ft each at 500+ mph descended toward Rapid City AFB then made precision 30-40° climbing turn. (2) From 1960 onwards: SHIFT to 70% close approaches + occupant observed + occupant encounters, predominantly nighttime, primarily public witnesses. (3) Military installation intrusions: EXCLUSIVELY at night throughout entire study period, even when other activity was daytime. (4) Interactive flight: slightly more incidents with non-military than military aircraft — consistent with messaging/display rather than purely military survey. (5) Loitering most prominent 1949-1959. SCU assessment: occupant reports and observed messaging behaviors “indicate intelligence” — the most direct SCU statement to date on NHI.