To my knowledge, we aren't currently using Invisalign in the AF. Ortho is not an entitlement in the armed services. Most cases completed by Orthodontists are orthognathic cases and are best treated with fixed appliances. As a GD, I do treat some ortho cases, but I go with fixed appliances or modified Hawley type retainers.
Invisalign has a significant cost compared to conventional fixed appliances. I think the Tri-service Ortho residency provides some training in Invisalign, but it's not used much.