On 15 January 2004, after the completion of the initial invasion of Iraq, the 502nd MI BN deployed in support of Operation Iraqi Freedom II, making this its first combat campaign in 52 years. Upon arrival in Baghdad, Iraq, the battalion reorganized with some additions as Task Force Rainier. This battalion task force provided critical mission command for Tactical Human Intelligence Teams operating throughout Iraq in support of Multinational Force-Iraq (MNF-I) and Multinational Corps-Iraq (MNC-I). The battalion returned to Fort Lewis in December 2004.