The think that disturbs me more is if the poor high-ranking officer husband is going to have some bad days, or a damage to his personal career, reputation etc. because of this brilliant idea of his wife.
I would say: ask the husband. Isn't he the boss in the family?
If he says "go on", go on.
If he says "go on but keep the photograph within homeland", go on but keep the photograph.
If he says "you want to make me ridiculous thinking that I need a nude picture of my wife for whatever reason which I will not even mention, then just don't", just don't.
OK there is no more "surprise effect" but I think that would be more considerate.
And in any case one can make a picture, scan it and send it by some electronic means so that he can keep this picture in his smartphone, if he feels so inclined.