From Halopedia, the Halo wiki
The UNSC commercial fleet is the merchant navy of the United Nations Space Command. It is managed by the UNSC Department of Commercial Shipping.[1] In 2524 and 2525, the fleet lost several freighters operating from Harvest to the Covenant ship Minor Transgression.
Unified Earth Government (President of the Unified Earth Government • Secretary of Defense) • Security councils (UEG • UNSC) • Joint Chiefs of Staff