A prosecutor says numerous former and current members of the Arizona Air National Guard will likely pay back thousands of dollars and avoid trial over a scam to obtain expense pay.

Arizona Assistant Attorney General Michael Jette said he expects the majority of accused members of the Tucson-based unit to take the "diversion agreement," which would allow for the charges to be dropped.

Jette said the Guard encouraged the deal to avoid a prosecution process that could have taken up to four years.

Retired Col. Gregg Davies, a former commander, has already agreed to the same deal.

An indictment last year accused all 21 defendants of fraudulently collecting $1.4 million in additional living-expense pay from the federal government between November 2007 and September 2010.