FIVE Australians recently killed in Afghanistan were remembered in a Legacy service at Murwillumbah on Monday.

About 100 people were at the Murwillumbah Services Club in a memorial service as part of Legacy Week and wreaths were laid at the base of the Australian flag outside the club.

Murwillumbah Legacy chairman Ian Campbell said the death of five soldiers in Afghanistan last week was a "tragic reminder."

Three soldiers were killed and two wounded after a gunman in an Afghan National Army uniform opened fire on Australian in a patrol base in the Baluchi Valley last week.

In a separate incident two Australian Special Forces soldiers died in a helicopter crash on the same day.

"It's a tragic reminder of why we have Legacy," Mr Campbell said.

"There have been 90,000 men and women who have circulated through Iraq and Afghanistan.

"You can imagine the problems the boys and girls will have later in life these memories come flooding back."

Mr Campbell said one Australian who was killed in Afghanistan recently was on his sixth tour.

About 170 Murwillumbah widows receive support from Legacy.

Iris Bennett has been involved with Legacy for about 21 years since the death of her husband in 1991.

"It's good support a lot of the ladies wouldn't go anywhere without them," Mrs Bennett said.

Badge Day is on Friday with volunteers and school students selling badges to raise money for Legacy.