no
J. Edgar Hoover .
The atom bomb was not in existence during World War One, also known as "The Great War".
While elite units were in existence during the Second World War, the US Army Special Forces was not.
Special Air Service, an elite unit of the British military created during World War 2 and still in existence today.
Directly, the Russo-Finnish War and the Second World War. Indirectly, pretty much every conflict in Asia, Africa, and the Middle East during the existence of the Soviet Union.
yes at the bottom of the ocean.
no only during ww2
The FBI and Army and Navy counterintelligence agents and OSS agents spied on the spies to prevent them from gathering info
The FBI's role during the Vietnam War primarily focused on internal security and counterintelligence efforts. The agency gathered intelligence on potential threats to national security, monitored anti-war and protest movements, and conducted investigations into suspected domestic subversive activities. The FBI also provided assistance to federal agencies and military authorities in matters related to national security and counterinsurgency operations.
It eventually pushed Germany into submarine war, which eventually brought the USA into the war.
During world conflict, no. The times the Olympic Games were cancelled was in 1916 during World War I and 1940 and 1944 during World War II.
Tanks (armored cars) were used for the first time at the Battle of the Somme during World War 1. More modern tanks were developed just before the end of the war. Anti-aircraft guns, sub-machine guns, and automatic rifles that could be used by one man, were developed during World War 1. The hand grenade was in existence but was quickly developed for use during WW1. Poison gases such as chlorine gas and mustard gas were first used in World War 1 although they had already been developed.