NLO above Bihać Airfield — Bosnia, 1970

In late 1970 — approximately two to three months after a radar-triggered MiG-21 intercept attempt over Plaško on 20 August 1970 — a group of Yugoslav National Army (JNA) pilots gathered on the ground at or near Željava Air Base (Aerodrom Bihać), Bosnia and Herzegovina, and observed a large luminous object hovering silently above the airfield. The object remained stationary for a period before accelerating away and disappearing from both visual and (based on the parallel Plaško case) radar contact. No intercept was launched. The incident was never publicly acknowledged by Yugoslav authorities. The principal chronicler of the Bihać sighting is Colonel Suad Hamzić (Sarajevo, 1945 – Mostar, 2019), one of the most accomplished fighter pilots in the history of the Yugoslav Air Force. Hamzić graduated from the Yugoslavian Air Force Academy and attended the RAF Staff College in Great Britain. In 1980 he evaluated the F-5 fighter jet in the United States, and from 1986 to 1990 he served as military attaché of the SFRY in Turkey. He retired as a colonel in 1993 after a career spanning supersonic jets from the MiG-21 through more advanced types. Hamzić first published his UFO encounter memoirs on a Serbian Air Force history platform (Tango Six) in early 2014, and the accounts were widely reprinted in Bosnian (Nezavisne Novine, Radio Sarajevo, Faktor.ba), Serbian (Kurir, Novosti), and Montenegrin media. He described the Bihać airfield sighting as a collective ground observation by "a group of pilots" — necessarily numbering at least several, given the context of a unit standing down from flight operations. No individual names other than Hamzić's own have been published for this specific incident. The object described in the Bihać incident closely matched the one Hamzić and co-pilot Captain First Class Dušan Stipić had pursued from the air two months earlier. In that earlier engagement, the object appeared as "a very brightly lit silver star" that grew visibly larger as the MiG-21 climbed past 14,000 meters at Mach 1.4. Over Bihać, the pilots observed it from the ground and described the same basic characteristics: a large, self-luminous, apparently disc- or sphere-shaped object that hovered without sound. The hover lasted long enough for the assembled pilots to observe it clearly before it accelerated and "disappeared in the same manner" — i.e., a sudden high-speed departure leaving no visible trail. Bihać sits in a mountain valley at approximately 245 m elevation; Željava Air Base was partially built into the Plješevica ridge on the Bosnia-Croatia border, giving ground observers clear sightlines into the surrounding sky. Three characteristics distinguish this sighting from conventional aerial phenomena. First, the object was stationary — hovering in still air without rotary motion or any audible propulsion signature observed by trained aviation personnel standing outdoors. Second, its departure was instantaneous: no gradual acceleration, no sonic boom, no visible propulsion plume. Third, the object was seen in late 1970, during a period of heightened Yugoslav air defense sensitivity following several months of persistent unidentified radar returns over the Adriatic and inland Bosnia. Hamzić explicitly connected the Bihać sighting to the earlier Plaško airborne intercept, treating both as encounters with the same or similar phenomenon. No physical traces were reported on the ground. The parallel Plaško incident two months earlier provides important instrument context: Belgrade military radar tracked an object at estimated altitudes above 17,000–22,000 meters during the airborne phase, while local radar at the Radar Center reportedly confirmed the target's existence before it departed. Whether the Bihać hover was tracked by Željava's own radar is not recorded in available sources. The absence of radar confirmation for the ground sighting itself may reflect the fact that the object was visually directly overhead at low enough apparent altitude to be outside local radar cone, or that available personnel were focused on visual observation rather than instrumentation. According to Hamzić's published memoirs, Yugoslav military authorities did not officially question him or any witness about either the Plaško or the Bihać incidents at the time. He wrote: "Neither we nor anyone officially asked us about what we saw, neither then nor later." Despite this silence, the Yugoslav Air Force Command established a dedicated investigation cell within the Command of War Aviation in Belgrade in the mid-1980s specifically to record and study pilot encounters with unidentified flying objects — a tacit acknowledgment that incidents like the Bihać sighting were part of a recurring pattern across the country's airspace. Flight logs and official records from the period were largely destroyed when NATO bombed the Yugoslav Air Force command headquarters in 1999 during Operation Allied Force, eliminating much of the documentary trail. Hamzić was clear that active-duty JNA pilots were strongly discouraged from discussing UFO sightings with anyone outside their immediate chain of command. In his words, pilots "were not allowed to say a word" about such encounters publicly. The professional and reputational risk of being labeled unstable or unreliable meant that witnesses self-censored for decades. Hamzić himself waited until retirement before publishing his accounts (2014), more than 40 years after the events. The destruction of Yugoslav Air Force records in 1999 further severed the evidentiary chain, leaving personal memoirs as the primary surviving documentation. The Bihać sighting is the only publicly documented collective UFO observation by JNA pilots on Bosnian territory during the Cold War era. Its significance lies in the credibility of the principal witness — a senior officer who later served as military attaché, trained at the RAF Staff College, and evaluated American aircraft — and in the fact that Hamzić explicitly connected the Bihać hover to a broader pattern of Yugoslav military encounters that stretched across the SFRY throughout the early-to-mid 1970s. Željava Air Base was one of the largest and most strategically sensitive military installations in Cold War Europe; that a group of its pilots would observe an unexplained aerial phenomenon hovering above their own airfield without explanation underscores both the strangeness of the incident and the institutional culture of silence that surrounded it.