I spent some time in recruitment offices (despite not recruiting as a side job). As well as training newly ascendant sailors fresh out of boot camp.OK I was just wondering.
There are a lot of different waivers for different things. But the norm is two parental signatories at 17. But the most common avenue is for kids to wait until their 18th. No parents required.
The other option is for a 17 year old who is emancipated from family. They do not need parental permissions legally then.