From Halopedia, the Halo wiki
Petty Officer Richardson is a non-commissioned officer stationed aboard the UNSC Infinity.
Sometime in March 2553 he aided Admiral Margaret Parangosky and Fleet Admiral Terrence Hood on an inspection of the UNSC Infinity. Admiral Parangosky wanted to go to engineering to check in on Catherine Halsey and the Huragok stationed there, so Richardson got her a supply trolley so she wouldn't have to walk. After getting the trolley she dismissed him by telling him to go lead on Admiral Hood.