I believe these are legitimate concerns, but remember also the benefit of a sense of humor in challenging circumstance. That humor is often deliciously twisted to fit those circumstances - for example, some military humor doesn't "fit" all civilian sensibilities; in fact, stress relief or ordered play might be activities that would curl (a civilian's) hair. In addition, I'm sure many corresponders could cite jokes that have come across quite well in Free Mail, but they might not share with more gentle company.
If it doesn't appear as ordinance: If a balloon clearly resembles a balloon, and it made you smile, it might make them smile too. Why not write about your concerns to the receiver respectfully requesing they decide, given what they know about their own crew, to judge if it be employed for tactical play or resigned to the burn barrel. Whatever their decision, I'm sure they'd appreciate your concern for their welfare.
100s of starfish are beached & will perish if not returned to the sea. A man sees another tossing starfish into the surf & says: won't matter, can’t save ‘em all. The guy just throws another into the tide replying, it made a difference to that one.