The effort began Saturday.
There was a momentary flash of panic when volunteers realized they were running about 300 to 400 flags short. But they quickly located some more and got back to work.
They say they are confident they will have every grave adorned by Veterans Day on Monday.
The Riverside Press-Enterprise (http://bit.ly/1iVQiW1) reports the tradition began in 2007 when a handful of volunteers arrived at the veterans cemetery on Memorial Day with 1,000 flags.
It has grown every year since.