As of April 2015, travelers without a KTN/PASS ID/DoD ID number, including those who previously opted in through a frequent flyer program, will notice a reduction in the number of times they are chosen by the TSA for TSA Pre â .articipants in CBP's Global Entry, NEXUS or SENTRI program should visit the Global Online Enrollment System (GOES) website to obtain their PASSID, which is their KTN, or check the back of their card on the upper left side. An example PASS ID is shown below.
Actually there are 4 mints. Circulation coins are made in Denver (D mint mark) or Philadelphia (P or no mint mark, depending on the coin's date and denomination) Proof coins are made in San Francisco - S. Commemoratives are made in West Point - W.
1 Images are close to actual size on a 92-dpi monitor.  Silver Half Dollars and Dollars, and Gold Half Eagles and Eagles are still regularly minted as commemorative coins. Dimes, quarters, and half dollars are also struck in 90% silver for certain annual collector's sets.