As stated before, the disobediance of a lawfull command could stick. Also what could apply here is everyone's favorite:
103.60 – CONDUCT TO THE PREJUDICE OF GOOD ORDER AND DISCIPLINE (NDA 129)
But if the kid is a real piece of work then he/she could get this depending on the situation:
103.31 – MALINGERING OR MAIMING
(1) Section 98 of the National Defence Act provides:
"98. Every person who
(a) malingers or feigns or produces disease or infirmity,
(b) aggravates, or delays the cure of, disease or infirmity by misconduct or wilful disobedience of orders, or
(c) wilfully mains or injures himself or any other person who is a member of any of Her Majesty’s Forces or of any forces cooperating therewith, whether at the instance of that person or not, with intent thereby to render himself or that other person unfit for service, or causes himself to be maimed or injured by any person with intent thereby to render himself unfit for service,
is guilty of an offence and on conviction, if he commits the offence on active service or when under orders for active service or in respect of a person on active service or under orders for active service, is liable to imprisonment for life or to less punishment and, in any other case, is liable to imprisonment for a term not exceeding five years or to less punishment."