Atlas V
The need to replace the aging ICBM based launch vehicles brought together the Titan IV and Atlas III teams to design a new rocket. The Atlas V is what they came up with. The 1.875m core found on Atlas and Titan is widened to 2.5m, and powered by the advanced RD-180 engine tested on the Atlas III. The pressurized balloon tanks found on the old Atlas are no more, replaced with a stronger aluminum isogrid structure. Up to 5 AJ-60A solid rocket boosters may be attached giving 6 launch configurations. Both 2.5 meter and 3.5 meter fairings are available.
Atlas V versions are refered to by a 3 digit number. The first digit is the fairing size, 4 for 2.5m and 5 for 3.5m (4m and 5m in real life). The second digit is the number of boosters, 0-5. The third digit is the number of engines on the Centaur, typically 1. An Atlas V 551 would be a 3.5m fairing, 5 AJ-60A's, and a single engine Centaur.
The Atlas V Heavy launch vehicle is also available, using three Common Core Boosters strapped together.
The 400 and 500 series Atlas V use a Centaur V (Common Centaur) as the second stage.
The Common Core Booster consists of four parts. The upper and lower tanks and the engine. The RD-180 engine has multiple meshes. The 2.5 meter with pipe is used on Atlas V. 6 Star-5F retro motors should be placed on the intertank, aligning the nozzles with the shrouds modeled into the lower core tank.
There are five AJ-60A mounting positions around the base of the core. Align the bottom pin on the booster with the holes on the core. Due to the asymmetric layout of the boosters they should be place either singly or in pairs using mirror symmetry mode. Holding down the shift key will allow finer placement using angle snap.
To minimize the destablizing effect of the asymmetric layout, the core should be rotated so the side with the most boosters is on top when in flight.
An Atlas V 551 and 411.
