Wavelength (1983). Robert Carradine & Cherie Currie.
Here's the description from IMDb: "Two young lovers learn that a small group of **09**-like space aliens are marooned on Earth and are being held prisoner at a top secret military facility. The couple then decide to liberate the extraterrestrial castaways and help them make a rendezvous with a rescue ship sent from the alien home planet."
Obviously low budget, no big-name stars, as I've never recognized anyone in another movie, though the leads have done other works, and it never made it to late night cable. With the exception of E.T., this was the first movie I saw (7 yrs. old) that portrayed aliens as almost non-violent (they did kill people, just to survive), and I understood the concept that the REAL villains were the government.