after algerian independence, france moved its test range to french islands in the tuamoto archipelago in the western pacific. typical monitoring scenarios for tests in 1968 and 1970 involved nsa comint determining that a french test was imminent. upon that notice, kc-135r tankers, temporarily modified to carry masint sensors, would fly around the test area, as part of operation burning light. one sensor system measured the electromagnetic pulse of the detonation. another system photographed the nuclear cloud to measure its density and opacity.