> 60s and 70s, satellite [...] recon would find this kind of trap After the mid 70s. Until 1976, American recon satellites relied on dropping film canisters b

> 60s and 70s, satellite [...] recon would find this kind of trap After the mid 70s. Until 1976, American recon satellites relied on dropping film canisters back to earth so they had limited tactical relevance.