Original sentence: From 1999 until its conversion to the CV-22 in 1997, it was the only reverse-Associate unit in the USAF, co-located with the 711th SOS of the Air Force Reserve and having no aircraft of its own, flying the 711th's MC-130Es
Edited sentence: From 1999 until its conversion to the CV-22 in 2007, it was the only reverse-Associate unit in the USAF, co-located with the 711th SOS of the Air Force Reserve and having no aircraft of its own, flying the 711th's MC-130Es