USS W. S. Sims FF-1059 Kelly Green Ball Cap

I was a reservist in the Sims reserve unit out of Lansing, Mi. for several years in the late 70’s and early 80’s. During that time the Sims had a unique Kelly Green Ball Cap (picture attached). But I don’t remember the time frame nor the CO that initiated it. I do remember DESRON 9 at some point only allowing Sims personnel to wear the cap on board the ship and change to a standard cap when going shore side. I am putting together a scrap book of my Naval service and would like to date this and name the CO. The ball cap was made by New Era INC.
If anything could you possibly give me some idea of how to research this.

Best regards

Keith L. Phillips
Commander USN Retired

Dates of Command Commanding Officers
1.) 03 Jan 1970 - 09 Jul 1971 Cmdr. Charles Moulton Plumly
2.) 09 Jul 1971 - 21 Feb 1973 Cmdr. Gerrish Cecil Flynn
3.) 21 Feb 1973 - 15 Jul 1974 Cmdr. Thomas J. Moore
4.) 15 Jul 1974 - 07 Jul 1976 Cmdr. James Raymond Williams
5.) 07 Jul 1976 - 21 Jun 1978 Cmdr. Thomas P. Jones
6.) 21 Jun 1978 - 18 Apr 1980 Cmdr. Robert Dulaney Reeves II
7.) 18 Apr 1980 -10 May 1982 Capt. Robert Louis Hicks
8.) 10 May 1982 - 02 Jul 1984 Cmdr. James Stuart Schultz
9.) 02 Jul 1984 - 24 Aug 1986 Cmdr. Andrew C. Arje
10.) 24 Aug 1986 - 24 Feb 1989 Cmdr. Charles Todd Creekman, Jr.
11.) 24 Feb 1989 - 06 Sep 1991 Cmdr. Ira James Eick

So, it would be #6 or #7