Since November 2002, rockets from theDelta IV Medium family have been launched 29 times, all of which were successful. Its last flight was with a 3rd generationGPS satellite in August 2019.

The Delta IV Medium (also referred to as 'single stick'^[1][2]) was available in four configurations: Medium, Medium+ (4,2), Medium+ (5,2), and Medium+ (5,4).^[3]

• Delta IV Medium, codedDelta 9040, was the most basic Delta IV. It featured a single CBC and a modifiedDelta 3 second stage, with 4-meter liquid hydrogen and liquid oxygen tanks (called aDelta Cryogenic Second Stage (DCSS)) and a 4-meterpayload fairing. The Delta IV Medium was capable of launching 4,200 kg togeostationary transfer orbit (GTO). From Cape Canaveral, GTO is 1804 m/s away from GEO. The mass of fairing and payload attach fittings have been subtracted from the gross performance.^[4]

• Delta IV Medium+ (4,2), codedDelta 9240, had the same CBC and DCSS as the Medium, but with the addition of twoOrbital ATK-built 1.5-m (60-in) diametersolid rocket boosterGraphite-Epoxy Motors (GEM-60s)strap-on boosters to increase payload capacity to 6,150 kg to GTO.^[4]

• Delta IV Medium+ (5,2), codedDelta 9250, was similar to the Medium+ (4,2), but had a 5-m–diameter DCSS and payload fairing for larger payloads. Because of the extra weight of the larger payload fairing and second stage, the Medium+ (5,2) could launch 5,072 kg to GTO.^[4]

• Delta IV Medium+ (5,4), codedDelta 9450, was similar to the Medium+ (5,2), but used four GEM-60s instead of two, enabling it to lift 6,882 kg to GTO.^[4]

To encapsulate the satellite payload, a variety of differentpayload fairings were available. A stretched Delta III 4-meter diameter compositepayload fairing was used on 4-meter Medium versions, while an enlarged, 5-meter diameter compositefairing was used on 5-meter Medium versions.

The Medium (4,2) version last flew on 22 August 2019, marking the retirement of the Delta IV Medium variants.^[3][5]

• List of Delta IV launches
• List of Delta IV Heavy launches
• List of Thor and Delta launches
• List of Thor and Delta launches (2000-2009)
• List of Thor and Delta launches (2010-2019)
• Delta (rocket family)
• Delta IV Medium
• Delta IV Heavy
• Delta IV

• Lists of Delta launches
• United Launch Alliance
• Lists of rocket launches

• Articles with short description
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