ICMA Retirement Corp. hired Roxbury Capital to subadvise a portion of ICMAs Vantagepoint Aggressive Opportunities Fund. Roxbury replaces First Pacific Advisors, which was terminated because of personnel and ownership changes, said John Tobey, chief investment officer at ICMA. First Pacific is an affiliate of Old Mutual. Mr. Tobey added that ICMA made the switch because it wanted to boost growth characteristics in the fund. The funds two other subadvisers are TCW and MFS.