From Halopedia, the Halo wiki
Post-Covenant War conflicts
United Nations Space Command
The D78-TC Pelican, formally known as the Dropship 78-Troop Carrier is a model of the of the Pelican created after the Human-Covenant War.
The D78 has improved avionics and new thrusters. It has less armor and weaponry than the later D79-TC Pelican.