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The work on PAL prototypes remained at low levels until 1960. Sandia National Laboratories successfully created a number of new combination locks that were adaptable to different types of weapons. In the spring of 1961, there was a series of hearings in Congress, where Sandia presented the prototype of a special electro-mechanical lock, which was then known still as a "proscribed action link". The military leadership, however, soon realized that this term had negative connotations for the use of weapons by the officer corps ("proscribed" meaning "prohibited"), and decided to start calling PAL "permissive action link" instead ("permissive" meaning "allowing" or "tolerating").[citation needed]