Kram,
As an after thought to my above post, since 9/11 unless you have a valid reason for an endorsement like this and it directly relates to your current employment, I doubt you would be able to do an endorsement like this. All flying training organizations in the US now have to put names and addresses of all prospective students past their department of Homeland Security at least 30 days in advance of the training starting. One of the questions asked is why are you undertaking this training. If you replied to this with your quoted reason, I think it would raise some eyebrows and you may be refused an entry VISA.