  The symmetric and gauge-invariant energy-momentum tensors for source-free
Maxwell and Yang-Mills theories are obtained by means of translations in
spacetime via a systematic implementation of Noether's theorem. For the
source-free neutral Proca field, the same procedure yields also the symmetric
energy-momentum tensor. In all cases, the key point to get the right
expressions for the energy-momentum tensors is the appropriate handling of
their equations of motion and the Bianchi identities. It must be stressed that
these results are obtained without using Belinfante's symmetrization techniques
which are usually employed to this end.
