The letter of intent serves as a "notification" to your gaining unit and MPF that you intend to crosstrain once you PCS back to CONUS...so, until you know where you're going (base/unit) it serves no purpose to submit something.
Once you know where you're going (base/unit per your PCS orders) submit the letter of intent to the GAINING MPF and unit which will serve to notify them of your intent. If you take the PAST prior to PCS include the results.
FYI, I'm getting some additional info on xtraining, exceptions to policy, procedures, etc. and will post ASAP.
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Pararescueman/Webmaster/Administrator/RKC
The real test comes when all strength has fled, and men must produce victory on will alone...