NSA maintained Army reports on enemy intelligence and secret codes
By Harlan Pryce ·
Enemy agents were hunted and strategic secrets were guarded in files that remain partially blacked out by the National Security Agency.
A broken code is a death sentence for an asset in the field. When the enemy reads your traffic, the cost is measured in burned networks and missing soldiers.
In the trade, we speak of the "break"—that moment when a cipher is solved and the adversary's private thoughts become a public ledger. For the men of the U.S. Army, the pursuit of the break was not a theoretical exercise but a matter of survival. The file's catalogue entry records a series titled "United States Army Records Relating to Cryptology," a collection of redacted copies and original reports that chart the struggle to protect American secrets while stripping away the masks of the enemy.
"Enemy intelligence activities"
The archival description lists the contents of this series as reports and studies prepared chiefly by the Office of the Chief Signal Officer. These are not merely administrative logs; they include technical manuals for cryptographic devices, meeting minutes, and information analysis. The scope is focused on two primary pressures: the security of intelligence information and the monitoring of enemy intelligence activities.
To a man who has spent years in the field, the mention of "technical manuals" is the most telling detail. A manual is a blueprint for a wall. If the wall is thin, the asset is exposed. If the wall is breached, the entire operation collapses. The catalogue confirms that these records were maintained by the National Security Agency/Central Security Service, the modern inheritors of the Army's cryptographic legacy. The fact that these copies remain redacted suggests that even decades later, the methods of the break, or perhaps the identities of those who were broken, remain too sensitive for the public eye.
The Chief Signal Officer
The records are centered on the Office of the Chief Signal Officer, a position the public record tells us was established during the American Civil War. For over a century, this office was the nervous system of the Army. Its responsibilities were as varied as they were critical, spanning everything from homing pigeons and wig-wag flag signaling to the high-stakes world of satellite communications and cryptography.
When one looks at the broad history of the Signal Corps, the cryptology files represent the most guarded layer of that history. While the Corps managed combat communications and weather reporting, the cryptologic work was where the Army interfaced with the deeper, darker currents of the clandestine world. The records indicate a focus on "information analysis," the process of turning raw, decrypted intercepts into something a commander could actually use to win a battle or foil a plot. This is where the technical expertise of the radio engineer meets the intuition of the intelligence officer.
Redacted copies
The cryptology files do not exist in a vacuum. Related archival series provide a glimpse into the surrounding environment of mid-century intelligence. One such series, consisting of reports from the Radio Counter-measures Division, deals with the tangible wreckage of war: captured equipment, German radio tubes, and the specifics of airborne jamming. This is the hardware of the shadow war—the physical tools used to blind the enemy and deafen their commanders.
Another related record, a "Working Model of an Intelligence Plan" likely created around 1943, outlines the necessary components of a functioning spy network: coordination, liaison with military attachés, psychological warfare, and intelligence funds. This suggests a systemic approach to espionage, where cryptology served as the primary verification for the human intelligence gathered by assets in the field. If a spy in Berlin claimed a certain troop movement, the cryptologists in the Signal Corps were the ones tasked with finding the encrypted order that proved it.
There is a particular discipline to this kind of work. It requires the patience to stare at a wall of noise until a pattern emerges. It also requires the wisdom to know that no system is ever truly unbreakable; there is only the window of time before the enemy finds the flaw. The Army's records on cryptology are a testament to that constant, anxious race against the clock.
The catalogue entry leaves us with a stark reality: the records were transferred from the Army's Signal Office to the National Security Agency. The transition reflects the evolution of the craft, moving from a military support function to a global intelligence apparatus. What remains hidden behind the redactions in these reports is the only question that still matters: who was watching us while we were watching them?