Likely a warm season grass used on the fairways. Perhaps Bermudagrass? With the atypical frost/freeze seen this past winter, the grass went dormant which one wouldn't normally see in SoCal (but common in the Southeast). Simon
The management let the military carry out a nuclear weapons training exercise? :o) Nice Pinus pinea at the right of the new photo
The lines in the second photo seem to indicate a ground application of something but I have no idea what.
Excellent observations and deductions. Both the Buena Golf Course and the Olivas Golf Course were sprayed with glyphosate in preparation for renovation. The courses are bordered to the south by the Santa Clara River. Google Earth shows the Buena Golf Course after the applications. Both courses are on Olivas Park Drive in Ventura, California. The course on the other side of the river is the River Ridge Golf Course in Oxnard, California.