When I joined the Navy it was long lines from one place to another.
The actual exam was noting , it just took all day to get through it.
The physical was just a physical the most probing part was the old "turn your head and cough" it was nothing overall you have no worries.
You will stand in line, pee in a cup, stand in line, get an X-ray and so on it will be long and boring but nothing hard.
By the way: thank you for defending our freedom!