The Low Energy Charged Particle (LECP) instruments aboard the Voyager 1 and 2 spacecraft make composition measurements of energetic particles above about 0.3 MeV/nucleon.  Using one or both of the LECP instruments, observations have been made of magnetospheric ions during each of the four Voyager planetary encounters (Jupiter, Saturn, Uranus and Neptune) since the 1977 launches.   Presently, and between the planetary encounters, the LECP experiment has returned unique interplanetary data regarding energetic ions in the heliosphere, (currently, Voyager 1 is the most remote human artifact, at a distance of 81 AU or about seven billion miles from the sun, nearly twice the distance of Pluto's orbit).  In the outer heliosphere, the LECP observations contribute to the understanding of the so called anomalous cosmic rays (ACRs) which dominated during the solar-minimum conditions typical of the mid, to late 1990's.  ACRs are thought to originate as ambient neutral atoms that enter the heliosphere due to the relative motion of our solar system through the local interstellar medium (LISM).  Then some of these neutrals become ionized, "picked-up" by the expanding solar wind, and accelerated at the solar wind termination shock (where the solar wind velocity drops from super- to sub-sonic).  Some of the population of accelerated "pick-up" ions at the termination shock, now called anomalous cosmic rays, diffuse and/or drift back in toward the inner heliosphere and are subject to modulation due to propagating solar disturbances.  It is at this stage, as the ACRs are transported from the remote heliosphere back toward the sun, that the LECP measurements are made.  Since ACRs are influenced by the broad phenomena listed above, the study of these heliospheric constituents may bear on the physics of the sun, heliosphere, termination shock, and local interstellar medium.