Question: How long does Germany took to make a reentry in aircraft industry?
About the article "Treaty of Versailles", section "Military restrictions".

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In 2004, aircraft designer Burt Rutan demonstrated the feasibility of a shape-changing airfoil for reentry with the suborbital SpaceShipOne.
The wings on this craft rotate upward into the "feather configuration" that provides a shuttlecock effect.
Thus SpaceShipOne does achieve much more aerodynamic drag on reentry while not experiencing significant thermal loads.
The configuration increases drag, as the craft is now less streamlined and results in more atmospheric gas particles hitting the spacecraft at higher altitudes than otherwise.
The aircraft thus slows down more in higher atmospheric layers which is the very key to efficient reentry.
Secondly the aircraft will "automatically" orient itself in this state to a high drag attitude.
However, the velocity attained by SpaceShipOne prior to reentry is much lower than that of an orbital spacecraft, and engineers, including Rutan, recognize that a feathered reentry technique is not suitable for return from orbit.
On 4 May 2011, the first test on the SpaceShipTwo of the feathering mechanism was made during a glideflight after releasefrom the White Knight Two.
The feathered reentry was first described by Dean Chapman of NACA in 1958.
In the section of his report on "Composite Entry", Chapman described a solution to the problem using a high-drag device: 
Feathering may refer to:  Feathering, a technique used in computer graphics to blur edges.
Feathering (reentry) (also feathered reentry, or shuttlecock reentry), an atmospheric reentry technique for spacecraft Feathering (propeller), changing an aircraft or wind turbine propeller blade by angling the blades parallel to airflow Feathering (clutch), alternately engaging and disengaging an automotive clutch Tarring and feathering, a type of punishment of medieval and early modern times Feathering (horse), long hair on the lower legs of some breeds of horse  
The California Reentry Program (CRP) is a non-profit organization with the mission of helping California prisoners successfully reenter society.
It has operated in San Quentin State Prison since 2003 when Allyson West, an algebra teacher at San Quentin at the time, helped one inmate with the reentry process and realized the importance of reentry work and the lack of ability or interest of the state to reduce recidivism.
Working with San Quentin and recruiting volunteers, West founded the California Reentry Program which has helped several thousand prisoners so far.
CRP's mission is to help all California prisoners, but due to lack of resources, it only operates in San Quentin.
CRP incorporated in 2007 and received non-profit status in 2008.
CRP has roughly 25 volunteers and helps about 150-200 clients per month.
The primary service offered by CRP is reentry advising ranging from helping clients with one question to helping clients make a long term plan for reentry.
This is a critical service because California prisoners have no Internet access and very limited contact with the outside world.
CRP also runs a parole clothing program which gets donated clothing for prisoners upon release to provide an alternative to the $38 gray sweatsuits prisoners must purchase upon release otherwise. 
A reentry capsule is the portion of a spacecraft which returns to Earth following a space flight.
The shape is determined partly by aerodynamics; a capsule is aerodynamically stable falling blunt end first, which allows only the blunt end to require a heat shield for atmospheric reentry.
Its shape has also been compared to that of an old-fashioned automobile's headlight.
A manned capsule contains the spacecraft's instrument panel, limited storage space, and seats for crew members.
Because a capsule shape has little aerodynamic lift, the final descent is via parachute, either coming to rest on land, at sea, or by active capture by another aircraft.
In contrast, the development of spaceplane reentry vehicles attempts to provide a more flexible reentry profile. 
Gemini 6A reentered the next day, landing within of the planned site northeast of Turks and Caicos in the Atlantic Ocean, the first truly accurate reentry.
It was also the first recovery to be televised live, through a transportable satellite earth station developed by ITT on the deck of the recovery aircraft carrier USS "Wasp".
The Gemini 7 and 6A missions were supported by the following U.S. Department of Defense resources: 10,125 personnel, 125 aircraft and 16 ships.