I don't either, but the most it could save would be the soldier's life value times the current risk of death (i.e. assume the bodysuit prevents all deaths), not the full life value. And, although Lucius Fox is potrayed as a smart man, the context makes it seem like he was comparing $300k to the cost of a life, without adjusting for the chance that it would actually save the life.
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.