Led by a 68-year-old commander known as Grandpa, Ukraine's Steppe Wolves unit, is made up of volunteers who are considered too old to fight - but still want to.
Staying behind the front line, the mobile artillery unit use truck-mounted rocket launchers, take orders from field commanders and work with other troops, contributing to the war effort despite lacking official support from the military.
"We... get by thanks to the pension fund," commander Oleksandr Taran said.
The unit also depends on donations, in order to repair faulty rounds and capture weapons from the enemy.
Mr Taran said his unit has been attempting to officially join Ukraine's armed forces to directly receive ammunition - and salaries - but has so far been unsuccessful.
Younger men who have been ruled unfit to fight have also joined Mr Taran's unit.
