I am a seamstress in a flag company. The flag is probably polyester or maybe nylon and not really suitable for a quilt. Most printed flags are on a white poly which is overprinted with the design. Consequently every needle hole can reveal tiny white poly spots and snag runs, and any removal of stitches can really show. Sometimes a very judicious gentle ironing can coax the fibers back together to minimize the white needle marks, but it can be difficult not to overshrink and cause shine and puckering. Washing can be another nightmare with shrinkage and fading. I've seen fabrics with branch of the military panels which would be a better choice. Search the internet for QOV (Quilts of Valor) sites and photos for inspiration. I think I have some fabric with about 1 1/2" Marine medallions on black that was purchased several years ago. If I find it I'll send a pic to see if you can use it.