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when was the british flag first used
Internet was first used for military purpose which used the concept of packet networking. ARPANET was the first internet protocol to be used for communication.
The 105mm HE shell was first used in 1941, used with the 105 mm Howitzer M2A1(M101) by the United States.
Smoking shelters were first used many years ago, but are more widely used today due to smoking bans etc.
The Korean war was the first time Vertical Envelopment was used, or the use of helicopters to assist troops in battle.