On 1 June 2007 the following CoA was apporved for the 98th Civil Affairs Battalion:

http://www.tioh.hqda.pentagon.mil/Graphics/98CivilAffairsBnCOA.jpg

From the TIOH:

"Purple and white are colors used for Civil Affairs.  The angular gold diagonal stripe is a map symbol representing the Panama Canal Zone where the unit was activated as a Group.  The Spanish colors red and gold indicate the Latin American orientation of the unit’s activities.  The mural crown, a heraldic symbol of municipal authority, denotes the civil affairs operations and civic action functions of the unit.  The scroll and quill pen represent the contingency planning aspects and together with the masoned battlements of the crown connote the combined political-military activities.  The three projections at the top of the mural crown allude to the former numerical designation of the unit as the 3d Civil Affairs Group.  "