Possible Clues:

• Duty
• Something you must do
• Duty of current head of government in offering at Eucharist
• Compulsion from person in service rising to stop sacrifice
• Bond's got no alibi prepared
• Sacrifice involved soldier turning up for duty
• Duty of American soldier seen in retrospect in sacrifice
• Bond's got no alibi, unfortunately
• Offering one grand in debt of gratitude
• The burden of debt