ST. LOUIS (AP) _ St. Louis Rams defensive coordinator Bud Carson retired today, citing health reasons.

Carson, who turns 67 next month, was lured out of retirement last year. Under his guidance, the Rams' defense improved in 25 of 28 categories.

But at a news conference this afternoon, Carson said a respiratory condition was forcing him to step down and return to his home in Sarasota, Florida.

``I cannot give this job what I feel the job demands,'' Carson said. ``I'm going to be fine, but I have to give this up.''

The Rams named Peter Giunta and John Bunting co-defensive coordinators. Giunta was also named assistant head coach. Giunta was the Rams' secondary coach last season. Bunting was the team's linebackers coach.

``We are very disappointd that Bud has decided to retire,'' Rams coach Dick Vermeil said. ``We are grateful to have had him. Bud put our defensive system in place and we have people in place that he trained.''

The Rams also announced they will continue to hold their training camp in Macomb, Ill., for the next two seasons. The Rams have trained at Western Illinois University in Macomb the last two summers.