boof (OP) replied with this 1 year ago, 5 days later, 5 days after the original post[^][v]#1,337,446
The declassified NATO information for flag X-ray:
indication: EXERCISE
normally displayed: At fore yardarm. REPEATED BY ADDRESSEES
meaning: Evolution or exercise completed.
normally displayed: Where best seen. REPEATED BY ADDRESSEES
X TACK ___ (signal): meaning: Carry out for exercise the meaning of the signal following.
normally displayed: At yardarm.
X TACK ___ (signal inferior to second substitute): meaning: I am carrying out for exercise the meaning of the signal following.