Analyze this Published March 10, 2003 OPERATION ENDURING FREEDOM (AFPN) -- Senior Airman Joshua Fink takes an engine Spectrometric Oil Analysis Program sample. SOAP samples are an inspection tool for detecting and preventing internal engine component failure. Fink is a crew chief assigned to the 908th Expeditionary Air Refueling Squadron. (Photo by 2nd Lt. Nancy Kuck)