Seems, i was mistaken,....
I found this on the actual instructions to the i-751,..
NOTE: If you or your spouse are currently serving with oremployed by the U.S. Government, either in a civilian ormilitary capacity and assigned outside the United States, mailyour petition to the USCIS Service Center having jurisdictionover your residence of record in the United States. Include acopy of the U.S. Government orders assigning you and yourspouse abroad.
What Is the Fee?
The fee for this petition is $205.00.
The fee for biometric services is $70.00.
You may submit one check or money order for both thepetition and biometric services, for a total of $275.00.NOTE: Each conditional resident dependent, eligible to be included on the principal applicant's Form I-751 and listed under Part 5 of Form I-751, is required to submit an additional biometric services fee of $70,
including dependents residing overseas pursuant to military or government orders, regardless of age.Look at this Stef, its a news release about exactly what your asking,....found it after I replied,...I knew I had read something somewhere,...sorry looks like you have to pay,....I know I did!!