The answer to your question is YES. There are two reasons why that is: the Viet Nam War and the 26th Amendment to the Constitution, which lowered the voting age from 21 to 18 in 1971. This allowed 18 year olds to enter into legal contracts without parental consent.
tank. 1. a large container or structure for holding a liquid or gas. 2. an armored combat vehicle, moving on caterpillar treads and usu. armed with a cannon mounted inside a rotating turret. 3. a prison cell for more than one occupant, esp. for groups of new prisoners. 4. a natural or artificial pond, esp. for storing water.
tank (n.). 1610s, pool or lake for irrigation or drinking water, a word originally brought by the Portuguese from India, from a Hindi source, such as Gujarati tankh cistern, underground reservoir for water, Marathi tanken, or tanka reservoir of water, tank..