SLC-4 and SLC-3 are launch
pads for Titan and Atlas rockets, not far away from SLC-6.
The two Titan launch pads of SLC-4.
Left: SLC-4E (East), for Titan IV rockets.
Right: SLC-4W (west) for Titan II rockets.
(might be vice versa, corrections welcome...)
One of the two Atlas launch pads of SLC-3