I commend you for your thoughts and efforts. There are some points omitted from those that answered, maybe due to their time and length of service. First you need to decide if you are taking care of Veterans, Personnel who served, current Service personnel, or all who wore the uniform. The reason that makes a difference is due to what the individual will have to show for their past or present service. As stated, Service personnel cannot send you a copy of their ID card, as you can be a terrorist collecting data or using same to duplicate for subversive reasons. In person verification , ie Lowes - Home Depot, is easy as the service person past or present can present their ID card. A DD214 will articulate a service person status as to veteran or tell you who served. I do think that is more than you need to determine. Based on your statements, you are looking for those who gave some and further show that you are part of a grateful nation. Thus to your end, I think it can only be accomplished in person. The USO and the Wounded Warrior Project are worthwhile organizations but might not be the answer you are seeking. Make the effort to seek local verification, which is easier said than done. IF you still interested, PM me to work through some of the issues.