  In this article we consider the Casimir energy and force of massless Majorana
fermions and vector bosons between parallel plates. The vector bosons satisfy
perfect electric conductor boundary conditions while the Majorana fermions
satisfy bag and chiral boundary conditions. We consider various piston
configurations containing one vector boson and one fermion. We present a new
regularization mechanism the piston offers. In our case regularization occurs
explicitly at the Casimir energy density and not at the Casimir force level, as
in usual pistons. We make use of boundary broken supersymmetry to explain the
number of fields that appear in all the studied cases. The effect of chiral
boundary conditions in a fermion boson system is investigated. Concerning the
supersymmetry issue and the vanishing Casimir energy, we study a massive Dirac
fermion-scalar boson system with bag and specific Robin type boundary
conditions for which the Casimir energy vanishes. Finally a two scalar bosons
system between parallel plates is presented in which the singularities vanish
in the total Casimir energy. A discussion on boundary broken supersymmetry
follows.
