N.A.S.A.'s Orion spacecraft intended to take space travelers to Mars is scheduled for its first significant mission in 2017 in what is called a distant retrograde orbit. That is a budget orbit around the moon that doesn't require fuel expense to keep the orbit after the spacecraft arrives. L-3 and L-5 apparently do cost something according to an explanation in Aviation Week 7 Space Technology June 23, 2014. Orion concept image credit-N.A.S.A.http://www.nasa.gov/content/five-things-we-ll-learn-from-orion-s-first-flight-test/#.U6x505TzZmg
As Buzz Aldrin suggested among others, construction of an Earth-Mars orbiter permanently making the voyage perhaps helped with ion engines could be a method for regular shuttle of astronauts to mars and back. Landers sent from Earth or the Moon on auto pilot could be sent to meet visitors to Mars down to the planet surface from the Earth-Mars shuttle.
It could be useful to design a number of low cost and effective Bernoulli sphere Earth-Mars taxi capsules with cosmic-ray protection for biological life given with water made from ice strewn around the solar system. Nearly ten feet of water are required to defend against cosmic ray damage. One hopes that N.A.S.A. has encouraged with some sort of incentive design competition to get ideas for Bernoulli sphere containers for solar system taxis.
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