Bluebulb Projects' The Measure of Things presents:
70 is about the number of Submarines in the US Navy
In other words, the count of Submarines in the US Navy is 1 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
The United States Navy maintains a fleet of 72 active submarines. A typical submarine goes to sea with a crew of about 140.