The old elf's trademark cigar, popped into his mouth as he orders the war brought out of the dungeon.
Boomer's cigar is a small, exact piece of staging in the epilogue. Having confirmed with York that the breaching suits, enhancement zone suits and Cronus-class Power Armor are all online, Colonel Boomer says fuck yeah and pops the cigar into his mouth.
Only then does he give the orders that end the chapter: four Cronus suits set aside for a landing skiff to back up a pregnant veteran on the surface, and for the rest of them, time to bring the war out of the dungeon and warm up the lasers. The cigar marks the moment the resistance stops hiding.
A chewed cigar, popped into the mouth rather than lit, a fixture of Boomer's comm-screen presence.
The prop that punctuates Boomer's order to begin phase two.