Is it even legal to enlist in the US armed forces if you’re like a royal of another country?

Depends on the laws of that country, but probably not.

If you are talking about the netherlands, ANYBODY legally Dutch who joins a foreign army without permission from the dutch government automatically LOSES the dutch nationality.

No

Source(s):

....I am a retired police officer. I retired as a sergeant, after 29 years, from a very large department, about 12,000 officers. I was a patrol officer for 4 years in a very diverse area. I was a tactical officer in the high rise project areas of my city. We called it vertical patrol in that we walked the the stairways of the high rises most of the time. I did that for 5 years and was promoted by test to detective. I worked violent crime (homicide, sex, officer involved shootings, robbery, kidnapping, serious non property incidents) for 11 years until I was promoted to sergeant. I worked as a street supervisor, a bicycle patrol supervisor and a desk sergeant/watch commander.

During my time as a tactical officer and a detective I was a unit representative for the police union.

I have a B.A in English and an M.S. in Law Enforcement Administration....

The USA does not have ANY "royalty". NOBODY CARES who her ancestors were (and it's probably bullshit anyway). If she is an American citizen, she can enlist in the US Navy.

I enlisted and i'm a prince of Wakanda

And this kiddies is your bed time fairy story for this week!

If you have swallowed this crap then do you want to buy the keys to never never land.

As Peter Pan wants to buy the lost boys a gift!

UP DATE ether she is telling lies or you are!

my husband did 20 years and can trace his ancestry back to the first kings of Scotland.

and no her claiming to be of a royal bloodline does NOT make her a Princess.

No-one is going to care.

She can't CLAIM royalty while serving in the US military. That said, it is EXTREMELY likely that if you trace ANYONE'S ancestry far enough, you can say they are from a 'royal bloodline'.

A girl from my rotc is planning on enlisting in the Navy

That literally CAN'T be true. Being in ROTC means you have ALREADY signed up to be a military officer. An officer CAN'T enlist.

Probably depends on the rules in the country where she holds this mythical title.

Only US citizens and legal permanent residents can enlist.