Then you will spot two collapsed buildings farther up the road. There is a nuclear warhead which you need to detonate in order to pass; doing so will also kill a marked man in the collapsed building. If you climb this building you will find The Crow's Nest, where the advanced riot gear, along with one of Ulysses' holotapes, is located.
Continuing past the Crow's nest, four deathclaws will be on the high road near the Ruined Highway Interchange. The first will jump on the roof of the trailer when you walk inside. The second is up the road a bit. Another nuclear warhead is located here, on top of a truck - the third deathclaw is visible once this is detonated. The fourth is hiding behind a large rectangular container.
The high road ends past the next bend, and there is a small road going off to the left which you must take. The Junction 7 Rest Stop is located to the right of the high road at the end. If you take the road down to the rest stop, the deathclaws may respawn on the overpass.
Follow the small road right to the end, where you will find the Ashton Silo Control Station. Activate the console after ED-E has tinkered with it to trigger another audio log from Whitley, and to complete the quest.
Reach Ashton Silo Central Station at the end of the High Road.
Activate the console to gain access to Ashton Missile Silo.