Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Old Man's War
The operation to stop the Eneshan invasion in 'The Ghost Brigades' is a combination of this, Nightmare Fuel, and a Moral Event Horizon for the people who planned it. It is completely unsurprising that Jared had a Heroic BSOD halfway through.
The eulogy for Enzo Gugino in 'Zoe's Tale'. Made even worse by the fact that the last poem he sent Zoe could well be interpreted as a marriage proposal.
Made even more poignant when you go back to 'Last Colony and remember how little Perry thought of that character.