The term, Godspeed, is relatively obsolete. However, it's most common meaning, of wishing someone a safe journey will never be outdated.
To all the veterans, the men and women currently serving their country, and to their families, I would like to say Thank You!! Because of your sacrifices and dedication, I am able to live the life that I do. I'm honored to have had several relatives in the military and appreciate their time in service.