For USNA, I believe you shared with the SAF community that the USNA Ship selection event is scheduled for later this week - official announcment details:
https://www.usna.edu/PAO/events/2023/02/Ship_Selection.php
My understanding is yes - there are NROTC ship selection ceremonies done at the national/ global level for both winter and spring commissioning classes.
- Likely you were watching the November 9th, 2022 NROTC Winter ship selection for a smaller group of midshipmen who commissioned in December, 2022.
- This larger, often spread out over 2 day event held in later February each year is for those commissioning in the Spring.
- If you search youtube for "Winter 2021 NROTC Ship Selection" or " Spring 2022 NROTC Ship Selection - Day 1" you can see examples of each selection ceremony.
I think service selection in the Fall - where Mids learn whether they are going subs, aviation, SWO etc. and what role (student naval aviator, student naval flight officer, et al.) is on a cadence where NROTC mids find out first with USNA mids finding out some weeks later. USNA was near 11/18 per this official article:
https://www.usna.edu/NewsCenter/2022/11/NAVAL_ACADEMY_CLASS_OF_2023_OBTAIN_CAREER_ASSIGNMENTS.php
The NROTC selection ceremonies were held at the unit level and were some weeks earlier, near 10/5 in 2022, reportedly with all units having those ceremonies within a couple of days of each other- there was an initial glitch which caused maybe a 1 day delay then units regrouped - some immediately, some within a couple of days.
Hope that helps.