The On-the-Roof Gang

The On-the-Roof Gang

by Matt Zullo

Genre:

Historical drama; war (WW2).

Logline:

Seeking death to escape a searing survivor’s guilt and the shame of a forbidden love, a WWII Navy radioman intercepts the secrets that help turn the tide of the Pacific War.

Location Settings:

Washington, DC; Hawaii; ships at sea.

Short Synopsis:

Based on the declassified true story written by Matt Zullo.

Ray Rundle is a brilliant but cocky Navy radioman who volunteers for the "On-the-Roof Gang," a secretive unit of elite radio interceptors hunting the Japanese Imperial Navy through the airwaves. He is so skilled at his job that he treats it like a game — until Pearl Harbor. When his cousin Louie is killed in the attack, Ray is consumed by a survivor's guilt so toxic it feels like madness: he is secretly in love with Louie's fiancée, Bernice. Desperate to escape his shame and driven by a subconscious death wish, Ray volunteers for the Pacific’s deadliest deployments — Coral Sea, Midway, and the hunt for Admiral Yamamoto — hoping the war will punish him for his forbidden love. The irony is cruel: Ray is too good to die. His "golden ear" detects the enemy before they strike, saving thousands of lives, including his own. The more he seeks danger, the more of a hero he becomes. The breaking point arrives on the USS New Mexico when a kamikaze turns the radio room into an inferno. Trapped and ready to die, Ray finally realizes that dying would be the ultimate insult to his cousin’s memory and decides to fight. He claws his way to safety, not as a victim, but as a survivor ready to finally answer Bernice’s letters and claim the life he saved.

Comps:

The On-The-Roof Gang is not just a war movie but a story about the cost of vengeance. It explores the psychological toll of being the "ear" that directs the sword. While the world celebrates the admirals, this film reveals the terrifying intimacy of the radiomen who monitored the enemy's communications. It is The Imitation Game with the visceral combat stakes of Greyhound.

Characters:

Main Character:

Ray Rundle – From a young, brash Navy radioman to a seasoned, traumatized intercept operator. Initially cocky and lighthearted, Rundle is traumatized by his cousin Louie's death during the Pearl Harbor attack. He volunteers for dangerous missions, driven by a desire for revenge. Throughout the war, he becomes increasingly haunted by past trauma, particularly a childhood incident in a burning shed. His experiences at sea, including losing his close friend Walter Rougeux, further compound his emotional wounds. By war's end, he's a changed man - scarred physically and emotionally, but ultimately finds healing through reuniting with Bernice and honoring the memory of those lost.

Other Characters:

Harry Kidder – A dedicated Navy Chief who transforms a group of young radiomen into the elite 'On-the-Roof Gang' of intercepting operators. He's a mentor and father figure who trains his operators with precision and care. Kidder is instrumental in developing radio intelligence capabilities, pushing for innovative approaches like placing intercept operators on ships. He supports his men through the war, recognizing their sacrifices and potential. By the war's end, he's proud of the team he's built and the critical intelligence they've gathered.

Louie Kern – Rundle’s cousin and childhood best friend. Joins the Navy with Rundle and is assigned to a nearby navy base. Killed during the Japanese sneak attack.

Bernice O’Connor – Childhood friend to Rundle and Louie. Engaged to Louie when he is killed; she and Rundle are secretly in love.

Walter Rougeux – Initially introduced as an optimistic, cheerful new intercept operator who contrasts with Rundle's initial hostility. He becomes Rundle's friend and trusted colleague, maintaining a positive attitude throughout the war. His character culminates in his heroic dedication during the USS New Mexico kamikaze attack, where he continues intercepting communications until his death, symbolizing the ultimate sacrifice of the On-the-Roof Gang.

Hal Joslin – A minor but significant character whose fate represents the broader sacrifices of the war. Initially seen as a friendly colleague planning to marry, Joslin is stationed at Guam and becomes a prisoner of war. Though his direct storyline is limited, his experience underscores the human cost of the conflict and the resilience of those captured.

Laurance Safford – The “Father of Naval Cryptology” and leader of the US Navy’s radio intelligence effort. The buffer between upper management and the On-the-Roof Gang, he ultimately loses his job while protecting the secretive operations of the gang.

Agnes Meyer-Driscoll – The US Navy’s preeminent cryptanalyst and trainer of all the Navy’s codebreakers. Responsible for breaking the Japanese “Blue Book” code and a stalwart in the efforts to break JN-25.

Joseph Rochefort – Student of both Safford and Meyer-Driscoll who goes on to lead the Hawaiian codebreaking effort called FRUPAC. Instrumental in the victory at the Battles of Coral Sea and Midway, he is fired for daring to stand up to his superiors in proving the location of the Japanese attack on Midway Island.

Opening Scene:

The Imperial Japanese Navy swarms and attacks unsuspecting targets with overwhelming force.

Act 1: Prelude to War

In 1930, at the Main Navy Building in Washington DC, we learn that the Japanese naval activity was just an exercise. Lieutenant Commander Laurance Safford and codebreaker Agnes Driscoll discuss their concerns about Japan's military preparations. Despite their superior Captain Redman's lack of support, they decide to establish a secret program to train Navy radiomen to intercept and decode Japanese communications. They recruit Chief Radioman Harry Kidder, who taught himself the Japanese katakana code, to train these special operators.

Ten years later, in November 1940, Chief Kidder has established a clandestine training facility in a blockhouse on the roof of the Main Navy Building (hence the nickname "On-the-Roof Gang"). He teaches the final offering of the class, which consists of ten young Navy radiomen, including Ray Rundle, a cocky Montana native who serves as the class clown; Hal Joslin, a bespectacled sailor from Washington state who's engaged to be married; Duane Whitlock, a thin, skeptical recruit; and several others. The students are sworn to secrecy and threatened with charges of treason if they ever divulge their clandestine mission.

Rundle is assigned as an operator at intercept Station HYPO in Hawaii after he graduates from the On-the-Roof Gang training. Life is good in Heeia for Ray, whose cousin, Louie, is a US Navy aircraft mechanic stationed at Kaneohe Naval Air Station just a few miles away. Ray and Louie are more than just cousins, they’re best friends. We learn that Ray is secretly in love with Louie’s fiancée, Bernice.

Rundle uses his On-the-Roof Gang training to eavesdrop on Japanese communications in order to keep Navy commanders apprised of the developments. As the On-the-Roof Gang listens in, war seems inevitable.

Act 2: The Secret Weapon

On December 7, 1941, Rundle and Louie are heading to Waikiki Beach when Japanese planes attack Pearl Harbor. The cousins separate, and Rundle watches in horror as Louie is killed by strafing Japanese planes.

At Station HYPO, the radiomen work frantically, intercepting the Japanese attack communications. Rundle is devastated by his cousin's death but channels his grief into his work.

In the aftermath of Pearl Harbor, the intercept work performed by the On-the-Roof Gang becomes increasingly important to the war effort.

Rundle receives letters from Bernice, but he can't bring himself to read them, instead storing them unopened in his nightstand drawer.

Desperate to escape his grief, Ray volunteers for the 'On-the-Roof Gang's' deadliest deployments. He isn't looking for medals; he is subconsciously looking for a bullet. He volunteers for the USS Yorktownat Coral Sea, and when that ship is battered, he transfers immediately to the USS Enterprise. The irony is cruel: the more Ray puts himself in harm's way, the more his 'golden ear' saves the fleet.

In April 1943, Rundle hears a specific 'fist' on the airwaves. He identifies it as Admiral Yamamoto’s personal operator. The brass is skeptical because a mistake here sends American fighters into an empty sky and blows their cover. Rundle stakes his career and his unit’s reputation on the intercept, signing the log himself. His intel leads directly to the shoot-down of the architect of Pearl Harbor. Rundle has finally avenged Louie, but the victory feels hollow.

Act 3: The Tide Turns

As the war progresses, Rundle becomes increasingly aggressive in his attitude toward the Japanese. During Operation HAILSTONE, the American attack on the Japanese base at Truk in February 1944, Rundle cheers the destruction of Japanese ships, shouting "Kill him!" and "Fuckin' die, Jap bastards!" His outburst shocks both his colleagues and himself, as the trauma of witnessing Louie's death continues to haunt him.

By April 1945, Rundle has been promoted to Chief Petty Officer and is tasked with leading a team of intercept operators aboard the battleship USS New Mexico headed for Okinawa. Rundle is saddled with a new partner, Walter Rougeux — a bright-eyed, optimistic kid who reminds him painfully of Louie. Rundle treats him with icy distance, terrified that getting close to the new kid will only lead to another painful loss. But Rougeux’s relentless competence and spirit eventually break down Rundle’s walls, forcing him to care about a human again — a dangerous vulnerability in a suicide squad. New Mexico is struck by a kamikaze attack — the radio room becomes an inferno. Rougeux is killed instantly. Trapped by fire and grief, Rundle collapses next to his friend’s body, ready to let the flames take him. He closes his eyes, accepting his fate. Then, his hand brushes a puka shell necklace Louie gave him on the pier — a symbol of the paradise they promised to share. The sharp physical sensation snaps Rundle back to reality. He realizes that dying now would be the final insult to Louie’s memory. Choosing life for the first time since Pearl Harbor, Rundle claws his way through the searing heat and escapes through a porthole, leaving his death wish in the ashes.

Back at Station HYPO, a scarred and emotionally wounded Rundle is given two weeks' R&R by Chief Kidder. Before leaving, he finally reads all of Bernice's letters and writes to her, confessing that he's always loved her but stepped aside for Louie's sake. He asks her to wear a flower if she's willing to give him a chance. When he arrives in Miles City, Montana, Bernice is waiting for him in a dress covered with flowers.

On August 16, 1945, after atomic bombs are dropped on Hiroshima and Nagasaki, Rundle intercepts a Japanese surrender message in international Morse code rather than katakana. The Emperor has ordered all Japanese forces to cease hostilities immediately.

Final Scene:

As the men of Station HYPO celebrate the victory raucously – drinking, singing, and making toasts. Ray wears a wedding ring. News reaches them that the eight men of Station BAKER have survived their POW ordeal and the celebration intensifies.

Epilogue:

Forty years after the end of World War II, the intercept operations performed during the war are declassified. The On-the-Roof Gang gather for a ceremony to (finally) dedicate a memorial to the group. Rundle is in attendance with his wife or forty years, Bernice. A large brass plaque with the names of all 176 members of the group is unveiled. The men pose for a group photo as we fade out.

About the writer:

Matt Zullo is a retired U.S. Navy Master Chief who has more than 40 years’ experience in radio intelligence, now more commonly known as communications intelligence. He was first introduced to the On-the-Roof Gang in 2001, when he was selected for the prestigious “On-the-Roof Gang” award for career-long excellence in the field of naval cryptology. He holds a master’s degree in Strategic Intelligence from the National Intelligence University, where he researched and wrote his master’s thesis on the On-The-Roof Gang. He spent the subsequent years researching this group of the US Navy’s “greatest generation” and published a pair of books in 2020 based on these men. He is currently pursuing a master’s degree in screenwriting at the University of York (UK). Both the Naval Cryptologic Veteran’s Association (NCVA) and the National Security Agency’s (NSA) Center for Cryptologic History (CCH) recognize him as the preeminent expert on the On-the-Roof Gang and refer all questions about the group to him.