Olga Oliker is a RAND associate, but this isn't a RAND pub; it's a transcript of her testimony to the Oversight and Investigations Subcommittee of the House Armed Services Committee on 28 Mar 07. Cordesman's report that Tequila linked to was also presented. Here's the other two:

Robert Perito, USIP: Reforming the Iraqi Interior Ministry, Police, and Facilities Protection Service

Frederick Kagan, AEI: Iraqi Security Forces: Status and Prospects