The most noticable extant features of the WWII era at Bolsa Chica are the round concrete gun emplacements along the edge of the bluff. (Not shown in this photo.) These were never actually fitted with guns. The contractors didn't build them to the military's specifications. Ironically, these "rejects" are the once piece of this defense outpost that still stands today.
Sorry I didn't get a chance to post over the holiday. As always -- many, many thanks to our veterans.