Yes, it's clear the Kennedy patriarch was against World War 2. Joe Kennedy Sr remembered what happened during World War 1, where Europe and America millions of sons. He didn't like the idea of war. Later, he would lose his eldest son in the fight against the NAZIs. You may not know much about him. JPK Jr was a brave man:
Ensign Joseph P. Kennedy Jr. with his Navy flight trainer.
The President’s big brother was the one being groomed for a life in politics by The Old Man. He had served as a delegate from Massachusetts voting for FDR at the 1940 Democratic convention.
A very brave, athletic and conscientious man, he volunteered for service in the US Navy before World War II. After completing his training in multi-engine aircraft, JPK was assigned command of a US Navy B-24 Liberator on anti-submarine warfare duty, flying missions out of an airbase in the UK over the North Atlantic from 1943-44. On one mission, his aircraft was attacked by a Focke-Wulf 190, the German’s best prop fighter. Instead of hightailing it for a cloud bank, Kennedy turned his ship toward the fighter and ordered his crew to open up. The FW tore off.
After completing his tour, Joseph P. Kennedy Jr. was ready to be rotated stateside. Instead, he volunteered for a top-secret mission in which he would pilot an experimental version of the B-24 bomber. The 4-engine plane had been converted from being a bomber capable of carrying sixteen 500 pound bombs and requiring a 10-man crew into into one giant flying bomb.
The plan was called: Operation Aphrodite. The objective was to knock out the V-2 sites along the coast of France.
One of Hitler's superweapons, the V-2 was developed by Werner von Braun and his team at Peenemünde. History's first ballistic missiles were used to rain death, destruction and terror upon London. The allies were worried that if the Nazis continued developing their super-weapons, the V-2’s descendants would be delivering bombs — possibly atomic — to New York City.
So the US Navy and Army Air Corps developed a secret weapon to use against the German V-2 sites along the coast of France.
Kennedy’s job was to get the ship airborne from its airfield in Great Britain, point it toward Europe, and bail out over the countryside. Sounds simple, but it was anything but. It was state-of-the-art science, engineering, and warfare. Joe Kennedy’s plane was among a few Liberators and Flying Fortresses modified for a very early version of remote control.
The ship, basically, was history’s first guided missile. The entire fuselage was filled with Torpex and gelignite, IIRC, and was to be armed by a rather elaborate, and untested, electronic arming panel.
Like something out of Buck Rogers, the Navy equipped the airplane with a primitive 2-channel remote-control pilot. One radio signal could make the plane dive and climb and another signal could make it turn left and right. A prototype video camera would also send information to the Mother Ship, where the remote pilot sat before a tiny TV monitor.
Joe Kennedy and his fellow volunteer pilots were needed to get the flying bombs airborne. One aloft, they were to turn on the radio-guidance controls and arm the flying bomb. Then, somewhere over the English countryside, the pilot and bombardier were to bail out at an altitude of about ONE THOUSAND FEET.
The scientists and engineers in the Mother Ship would take over and signal on two radio frequencies: One to turn the stick RIGHT or LEFT; or push the stick FORWARD or pull the stick BACK. Primitive today, they were the first remote-controlled weapon of mass destruction. The Mother Ship would follow two miles or so back and then fly it over the English Channel and guide it down into the rocket launch sites.
It was dangerous work. Because of the modifications to the B-17s, one pilot was killed and another lost an arm in the process. By the time it was Joe’s turn in the B-24 there was reason for concern about a plan that was seeming to look like a suicide mission.
For the Kennedys and the future of American politics, the tragedy was that the Navy ship used a rather primitive arming panel. The regular engineer/co-pilot refused to fly and instead the Navy sent aloft the engineer who designed and installed the system.
Over the English countryside, the ship exploded, killing the two flyers and changing American political history. Joe's younger brother John Fitzgerald Kennedy then became the heir to the family's political ambitions.
John F. Kennedy made an outstanding President, living up to his brother’s promise of greatness. JFK, it should be remembered, saved the world from nuclear annihilation during the Cuban Missile Crisis.
While he never lived to see the dream realized, JFK also stretched mankind’s imagination and reach to the moon. Ironically, he even used the NAZI rocket scientist who developed the V-2 to do so. The same von Braun who the allied air command sent his lost brother, Joseph, to destroy.
— Octafish
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Two outstanding books on the subject of Joseph P. Kennedy Jr. and his service in World War II:
“Aphrodite: Desperate Mission” by Jack Olsen
and
“The Lost Prince: Young Joe, the Forgotten Kennedy” by Hank Searls.