The exact time of ULA’s NROL-25 mission was not disclosed, but ULA officials said they expect the launch to occur sometime between 2 p.m. and 5:15 p.m. PST.

   The launch will be the first of four that the NRO has planned this year in a group of missions that also includes an Atlas 5 on June 20 and a Delta 4-Heavy on June 28, both from Cape Canaveral, and another Atlas 5 from Vandenberg on Aug. 2.

   “Last year, we executed the most aggressive launch campaign in over 25 years. We successfully launched six satellites in seven months and this year with the same determination we’re scheduled to launch four more in five months,” NRO Principal Deputy Director Betty Sapp said in a statement.