The next generation is showing its big heart this Valentine's Day.

Generation Opportunity, a national grassroots organization, is working to make sure America's veterans know they are loved and appreciated on this holiday.

The group's president, Paul Conway, said their Valentines for Vets is just one way Americans can honor veterans. He said he's learned how tough the return home can be for vets.

"They have a sense of gratitude, and they know that they haven't been forgotten and their service, no matter how many decades ago, hasn't been forgotten," he told CBN News.

Conway said the "overwhelming response" has been from young veterans who have recently returned from Iraq and Afghanistan.

"The measure of respect and good feeling they get from it is just inestimable," he added.

People can submit their virtual Valentine's Day cards all day Tuesday by logging on to the organization's Valentines for Vets page on their website.

Real cards will be printed out on nice stationery and distributed to veterans across the country on Valentine's Day and the day after.

Thousands of people have responded so far. If you can't log on to submit your holiday greetings, be sure to tell a vet "Happy Valentine's Day."