Strands #813 uses the clue "Thank you" to point at Memorial Day remembrance. The official NYT Strands feed lists MEMORIALDAY as the spangram, with HONOR, PROTECTION, SACRIFICE, SERVICE, and VIRTUE as the theme words.
Sources checked: https://www.nytimes.com/svc/strands/v2/2026-05-25.json ; https://www.nytimes.com/svc/strands/v2/2026-05-24.json ; https://parade.com/living/nyt-strands-hints-answers-today-spangram-monday-may-25-2026 ; https://easternherald.com/2026/05/25/nyt-strands-hints-answers-today-may-25-2026/ ; live SERP for Strands #813 / NYT Strands answers May 25 confirmed answer-and-spangram intent.