In mid-1950, work began to construct the first permanent access road and launch sites on Cape Canaveral Air Force Station. The first area developed for launch operations became known as Launch Pads 1, 2, 3 and 4. Blockhouse 1&2 was constructed in the early 1950s (between 1951 and 1953) for use with the Snark winged missile program. The blockhouse had four-inch thick tempered laminated glass, and the image was received through the glass and reflected downward and inward to observers using a pair of mirrors and another tempered glass window. An observation deck was constructed above the blockhouse. The Air Force's Snark missile was a surface-to-surface pilot-less bomber with a range of over 5,000 miles. It was the first and only long-range intercontinental winged missile.