The Army started trying to measure the lights.

Between March and June 1949, soldiers and officers at Camp Hood — then still officially designated Camp Hood, later renamed Fort Hood and now Fort Cavazos — reported a series of unidentified aerial lights and objects in the skies above and around the Killeen Base area of Central Texas.

This was not one event.

It was a wave: at least 23 separate reports across roughly three months, each with its own date, witnesses, observation conditions and description. Some reports described bright lights moving across the sky. Others described objects with shape and structure. Several described trajectories and speeds that did not match routine aircraft activity.

The number matters. A single unusual sighting can be a misidentification. A wave of 23+ reports over three months, at a military installation with trained observers, is harder to dismiss as a single error — but it is also not one unexplained phenomenon. The wave almost certainly contains multiple stimuli: meteors, aircraft, balloons, astronomical bodies and possibly other causes, mixed together.

The correct approach is to treat each report individually before judging what — if anything — remains unexplained after conventional explanations are applied.

This is the strongest editorial thread in the Fort Hood record.

The military did not simply file the reports and forget them. The Army's G-2 intelligence section responded by establishing observation posts, assigning observers and attempting to measure what was being seen. They plotted positions. They estimated ranges. They attempted triangulation.

This is not the behaviour of a unit dismissing reports as weather balloons or misidentified stars. It is the behaviour of an intelligence apparatus that took the reports seriously enough to build a measurement system around them.

The observation effort involved:

• Observers: personnel assigned to watch specified sectors of sky
• Posts: fixed observation positions with known coordinates
• Ranging: estimated distance to the reported light or object
• Plotting: recording positions on charts or maps
• Triangulation: attempting to fix a position using multiple observation posts
• Later references: subsequent reporting that describes the observation effort as having produced triangulated or instrumented data

Exactly how successful the triangulation was, and whether it produced a coherent track rather than a series of unrelated positions, remains one of the open questions. But the effort itself — the Army trying to measure the lights — is the centrepiece of the case.

After the 31 March sighting, Lt. Frederick Davis reported telephone interference. This detail has been repeated in later retellings as evidence that a UFO caused electronic disruption.

Davis's sighting is part of the wave record. The telephone interference is a separate report that happened to follow it. Combining them into "a UFO disrupted the telephones" is not supported by the surviving evidence.

Several conventional explanations are credible for subsets of the Fort Hood wave:

• Meteors and fireballs: some reports are described in ways that match meteor activity — bright, fast, streaking. Texas in spring has regular meteor activity.
• Aircraft: Camp Hood was an active military installation with constant aircraft traffic. Military aircraft at night, seen from unusual angles or at distance, could produce unexpected light patterns.
• Balloons: meteorological and observation balloons were routine in the 1940s. A balloon caught in changing light conditions can appear to move erratically.
• Astronomical bodies: bright stars or planets seen near the horizon can appear to move when observed through atmospheric distortion.
• Wave aggregation: combining 23+ reports over three months into "one unexplained phenomenon" is itself an error. Each report must be assessed individually.

The conventional case is strong for many of the individual reports. The open question is whether any individual report resists all conventional explanations after the specific observation conditions, timing and witness reliability have been properly assessed.