These OV-10G+ Bronco (N592NA/155492 and N581NA/155481) are new additions to Cal Fire's fleet and were noted at McClellan, Sacramento, in October 2022. Both aircraft were waiting to go through Cal Fire's Aviation Management Unit for upgrade and conversion. The two former NASA aircraft had been part of a U.S. military program, led by U.S. Special Operations Command, known as Combat Dragon II, that explored light attack aircraft tactics, techniques, and procedures between 2012 and 2015, culminating with an actual combat field test in Iraq. Prior to that they had been used by the Department of State Air Wing on counterinsurgency missions in Colombia.
My report on Cal Fire is on my website at www.jetwashaviationphotos.com if you want to read/see it.