Skills may diminish but are never lost. Many of the things you do become automatic once mastered. I haven't copied code for 25 years but just copied 2 5 WPM on the ARRL site. In a few days I could get back to my old self.
Other skills really require minimum training. I heard this first in reference to climbing but have heard it many times about other shills. "***** is 10% skill and 90% confidence."
Another example would be language skills. A 30 day refresher will get linguists back to their previous level.
The real challenge is to keep abreast of advances in tactics and technology.
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