Iowa Public Employees Retirement System, Des Moines, is expected to issue an RFP Thursday for a bond manager to run $1.2 billion, said T.J. Carlson, investment officer for the $14.9 billion fund. Proposals are due Aug. 6. The fund is eliminating its strategic global bond mandates in favor of tactical exposure and is reducing duration risk, Mr. Carlson said. Funding will come from three terminated global bond managers. Performance was not an issue, he added. Wilshire Associates is assisting.