1917-01-07: accepted as Observer
1917-01-15: attached to 23Sqn, France.
1917-02-02: Holley was missing in FE2b, 7705; last seen diving steeply towards lines followed by hostile machine on escort to recce. His pilot, 2Lt Reginals Thomas Whitney, missing and made POW. Holley was wounded in the action that brought down their FE2b and was also made a POW.