Antonyms for the term 'aide de camp' may include words such as 'detractor', 'antagonist', and 'opponent'. These antonyms describe someone who is against the aide or who works against them, rather than assisting them as the aide de camp would assist their commanding officer. Other antonyms might include words such as 'enemy', 'adversary', 'foe', or 'rival', all emphasizing a more combative or competitive relationship rather than a supportive or complimentary one. It's worth noting, however, that such terms may not be entirely appropriate as antonyms, since they do not necessarily capture the full nuances of what it means to be an aide or assistant to a commanding officer.