Direct answer: A thoughtful, respectful message that expresses gratitude and acknowledges their service is best. Avoid generic just “Happy Veterans Day.” Instead, say something like: “Thank you for your service and the sacrifices you’ve made for our country. I’m grateful for your courage and the freedoms we share.” If you’d like, I can tailor a message based on who you’re speaking to (a veteran you know personally, a colleague, a retiree, or someone you’ve just met) and the tone you want (formal, casual, or heartfelt). Here are quick templates you can adapt:

• Personal (family or friend): “To [Name], thank you for your service and for the sacrifices you’ve made for our country. I’m proud to call you my [relation]. Happy Veterans Day.”
• Colleague or acquaintance (professional tone): “Thank you for your service and dedication. Your sacrifices help keep our nation safe and our freedoms secure. Happy Veterans Day.”
• Brief, respectful: “Thank you for your service. I’m grateful for your sacrifice and leadership. Happy Veterans Day.”
• If you know their branch (optional): “Thank you for your service in the [Army/Navy/Air Force/Marines/Coast Guard/Space Force]. Your commitment to our country is deeply appreciated. Happy Veterans Day.”

Tips to make it meaningful:

• Personalize with a specific memory, trait, or impact you’ve observed.
• If you’re writing a card, a short note is typically more impactful than a long paragraph.
• Pair words with an act of support, such as listening, expressing appreciation to their family, or supporting veteran-focused causes.

Would you like me to craft a message tailored to a specific person or setting?