Direct answer: The most appropriate thing to say to someone on Veterans Day is “Thank you for your service.” If you know the person’s branch, you can tailor a phrase, for example “Thank you for your service in the Army/Navy/Air Force/Marine Corps/Coast Guard,” or add a personal note about their sacrifices or experiences. Overall, avoid saying “Happy Veterans Day” to someone actively serving; many prefer a heartfelt thank-you and acknowledgment of their service. Context and nuance

• For veterans you know well: A personal message or a brief note of appreciation often feels most meaningful. You can mention a specific memory, contribution, or trait you admire.
• For someone currently serving: It’s usually better to say “Thank you for your service” and, if appropriate, offer support or congratulations on their commitment.
• For public or broad greetings: If posting publicly, a general expression like “We honor all who served and sacrificed for our country. Thank you for your service” is commonly used.

Practical options

• Short and simple: “Thank you for your service.”
• More personal: “Thank you for your service and sacrifice. I’m grateful for your dedication to our country.”
• If you know the branch: “Thank you for your service in the [Army/Navy/Air Force/Marine Corps/Coast Guard]. Semper Fi/Arriba/Hooyah as appropriate.”
• If writing a card or letter: Include a specific thanks, such as appreciation for leadership, courage, or sacrifice, and offer any practical help you can provide.

Notes

• Veterans Day is a time to honor those who have served. Phrasing that centers gratitude rather than a casual greeting is generally preferred by many veterans and active service members.