Hmm, I can really empathize with you, trips away are tough.
This post raises even more questions and the thread will probably be moved out of introductions.
What are your partner's justifications for this DADT policy of her lover's? You are not alone in your concern about it, it is generally a very frowned upon practice because Poyamory is supposed to involve honesty and the consent of all parties. Do you think it is a temporary situation?
Do you have agreed upon boundaries with the old boyfriends?
Do you have agreements about contact with your partner while she's away?
All these things are important . Coping with over two weeks apart is tough especially when she's seeing others while she's away.
I'm glad you've asked for help.