In addition to introducing us to the future-Spartan Locke and other characters the series gave us plenty of other additions to the Halo lore – starting with these vehicles.
The D-80 Long Range Transport was a staple of the UNSC for transporting goods and personnel into battle until phased out by the arrival of the Albatross carrier. The D-80s were sold off to Colonial and independent buyers such as the Sedran Militia who valued them for their durability and Slipspace capability.
The Bactrian-class freighter was an outdated model tug used on to ferry cargo on poorer colony worlds such as Aleria. It featured a biometric ignition system as a security feature and was Slipspace capable.