Not worried at all. Maybe you're not the only person that visited the museum and scanned the pics? I know there are a lot of copyright issues but I try to stay away from such material if it's explicitly marked as copyright protected or ask the respective owner of the copyright if I'm allowed to use his material which in most cases isn't a problem (example follows).
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Some pics of USN CSAR choppers.
SH-3A "Big Mother 70" of HS-2 in SEA colors on the landing deck of USS Mahan (DLG-11).
"Big Mother 70" after its conversion to HH-3A standard and in new color with HC-7.
The M134 mounted in the door of "Big Mother 70".
Note: The last two pics marked (C) W.Tanneberger are used with his kind allowance!
Following the only shot of an UH-2 with doorgun that I know of.
Another shot of an UH-2A with camo and a nice noseart.
If you want to know more about the history of USN CSAR helicopters and also Lt. Lassen you may check out this PDF.
http://www.ussmahan.org/HC7.pdf