SCU Activity Pattern Study (505 incidents, 9 UAP activity types) maps a clear behavioral shift over 30 years. Pre-1960: predominantly military domain, distance observation, daytime, focused on nuclear infrastructure. Post-1960: shift to civilian/public domain, nighttime, close approaches, reported occupant observations. Military activity continued targeting deployed atomic weapons throughout. Three major waves identified: 1951-1953 (peak July 1952, Washington DC overflights), 1956-1958 (peak 1957), 1964-1967 (peak 1967). The 1975 peak was entirely driven by activity at Minuteman III ICBM sites across the “northern tier” bases — Malmstrom, Minot, Wurtsmith, Loring — coinciding with full deployment of MIRVed warheads. UAP intrusions at military facilities occurred at night in 97% of cases. The 1975 northern tier wave included the Travis Walton case in Arizona on November 5, 1975 — occurring within the same concentrated window as the ICBM base incursions, in the same period, 4 days after the Malmstrom security events. Both military and public domain incidents shifted to predominantly nighttime by the late 1960s — consistent with adaptive stealth behavior documented in the Operational Presence 2026 paper.