WASHINGTON (AP) — Suicides among U.S. soldiers rose last year to the highest level in decades, the Army announced Thursday.

At least 128 soldiers killed themselves in 2008. But the final count is likely to be considerably higher because 15 more suspicious deaths are still being investigated and could also turn out to be self-inflicted, the Army said.

A new training and prevention effort will start next week. And Col. Elspeth Ritchie, a psychiatric consultant to the Army surgeon general, made a plea for more U.S. mental health professionals to sign on to work for the mil...