Should the mujaahideen who are fighting for the sake of Allaah break their fast?
Question

                Are those who are fighting the enemy allowed not to fast during Ramadaan and can they make it up afterwards?.
Praise be to Allah.
    If those who are fighting the kuffaar have travelled the 
    distance which allows them to shorten their prayers, then it is permissible 
    for them not to fast, but they have to make it up after Ramadaan. 

    If they are not travelling because the kuffaar have attacked 
    them in their own land, then whoever among them is able to fast whilst 
    fighting is obliged to fast, and whoever is not able to combine fasting with 
    the duty of jihad which has become an individual obligation (fard ‘ayn) for 
    him is permitted not to fast, but he must make it up later on, fasting the 
    number of days that he did not fast in Ramadaan. End quote. 

    Standing Committee for Academic Research and Issuing Fatwas