Submarine X-1 - 1969 is rated/received certificates of:
Australia:G
Finland:K-12
Singapore:PG
Sweden:11
UK:U
USA:G
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you press Q AND X to use submarine reflection. you press Q and X
to use submarine reflection.
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The Royal Navy used a submarine
called the X class submarine.
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press submarine then y to start n to go slower m to go faster x
to stop
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Germany had several missiles with the nomenclature of 'X-1 thru
X (?)' that were air-to surface. Also an X-4 that was an air-to-air
missle. They would be considered primitive compared to today's
armaments.