The final Titan IV was launched from Vandenberg on Wednesday. It carried a “critical national security payload for the National Reconnaissance Office”. Smile!
From the USAF Museum page on the Titans:
Titans have boosted numerous types of payloads into space. These included the Gemini spacecraft, various Air Force reconnaissance, communication, navigation, and weather satellites, and many NASA spacecraft such as the Viking I and II missions to Mars and the interplanetary vehicles Voyager I and II. The Titan program has played an important role in the expansion of the US military and civilian presence in space. It also provided a proven and economical booster for America’s first major commercial space launch program.
The Atlas V and Delta IV will cover most launches that the Titans previously handled.