Army Tank Birthday Thank You CardsArmy Tank Birthday thank you cards feature an adorable army tank with a little boy driving it. Camouflage detailing give this the perfect army feel for your little soldier. Some features of our thank you cards: Professionally printed on 80# cardstock paper so you feel the quality. Teaches children how to send a meaningful handwritten note Easy to use because all you have to do is simply fill in and mail out 10 cards and 10 white envelopes included 4.