In October 1971, North Vietnamese MiGs, operating from forward bases opened after the end of Rolling Thunder, began a campaign to intercept Boeing B-52 Stratofortresses missions over southern Laos. On 20 November, a MiG-21 launched air-to-air missiles at a B-52 that evaded by dropping flares. As a result, Warning Stars of Det. 1 returned to Korat RTAFB to provide radar support by flying the Laotian orbit again, using callsign "Disco". 7 EC-121Ts, replacement aircraft for the earlier series, were based in Thailand and contained both QRC-248 and Rivet Top electronic suites.