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I'm Tristan Redmond, one of the hosts of the Global Story podcast from the BBC.
How would the US invade Iran?
Different options are on the table, but the Pentagon has wargamed this for years.
And our guest today was in the room for many of them.
What are Donald Trump's remaining military options?
Listen to the Global Story on bbc. com or wherever you get your podcasts.
This is the Global News Podcast from the BBC World Service.
I'm Alex Ritson, and in the early hours of Thursday, the 2nd of April, these are our main stories.
NASA's Artemis II mission successfully blasts off for its historic trip into deep space and around the moon.
Donald Trump tries to convince America's TV viewers that the US is close to, as he puts it, finishing the job in Iran.
Also in this podcast.
One thing we should be worried about is that because these things operate as fleets,
that presents an additional risk, a cyber security risk.
Traffic chaos in the Chinese city of Wuhan as more than 100 self-driving robo-taxis suddenly stop.
Cape Canaveral in Florida at 6.35pm local time on Wednesday.
There was a roar that reverberated far beyond the launch pad.
Eight, seven.
RS-25 engines lit.
Three, two, one.