An IRR (Individual Ready Reserve) card still gives you access to on-base privileges. I got mine as soon as I was honorably discharged from the Navy and received my DD-214. If your friend still has inactive duty on his original contract then he is still eligible to receive an IRR card by visiting one of the major military bases nearby where they issue CAC cards to military personnel. I got mines at Camp Pendleton.
P.S. Is the fishing at Lake Narconian any good? This is my first time hearing of it, I had no idea there was a military base there.. my base sticker and IRR card don't expire until 2012. Are there any other military hot spots in the area? I totally forgot about Naval Weapons Station, Seal Beach as well.. Does anybody know if you're allowed to fish there?