Reprieve for axed Sentinel R1 Posted on November 24, 2011 by alert5 RAF chief Air Chief Marshal Sir Stephen Dalton says the Sentinel R1 spy plane may not be axed after all. Related posts (Automatically Generated): RAF chief says A400M “Grizzly” will enter service with that name over (his) dead body RAF’s new tankers could gain ISR role IAF and RAF chiefs to fly during war games RAF fighting to retain Sentinel R1 Air Marshal Nak Browne will be next chief of Indian Air Force India could opt for six additional C-17s