NASA participation in LISA was removed a couple years ago due to budget issues. The ESA portion went on (it's called NGO now), but I think NGO is pretty much a

NASA participation in LISA was removed a couple years ago due to budget issues. The ESA portion went on (it's called NGO now), but I think NGO is pretty much an acronym without funds. In general, in fact, space interferometers have been held up and moved to ground-based systems. (See also SIM and TPF.)