This is a generic skin for the free campaign "Through the desert dust" for the OH-58D "Kiowa Warrior". You must have it for the campaign to work properly. This skin shows an OH-58D from Operation Enduring Freedom in Afghanistan (read the campaign's manual how and wh ere to install it). The campaign must be downloaded as a separate zip file.
Link for the campaign: https://www.digitalcombatsimulator.com/en/files/3345522/