Make sure the service member files a police report and gets a copy of it.  Since he and his family are on official travel (Permanent Change of Station or PCS), I'm pretty sure the DoD will reimburse him for all uniforms and military equipment stolen.  Additionally, I believe any damage caused by the break-in to his vehicle will also be reimbursed.  Everything may be pro-rated for fair wear and tare but at least it is something.  A quick check of the join travel regulations should let him know.  The claim will be a part of his DD-Form 1351-2 travel claim.  But it all starts with the police report.  Make sure it is detailed and complete.