Can someone identify this warplane silhouette?
This is a B-1B Lancer.

It is a 4 engine (afterburning engines mind you, very rare for a bomber) variable sweep wing bomber, designed during the Cold War to use its terrain-following radar to stay low and fast, weaving between the mountains of Russia to stay below radar to deliver nuclear warheads.

It carries more bombs than the B-52 as well.

Essentially, it is a bomber built like a fighter. It is actually the only swing-wing aircraft in the entire US military right now.

Fun fact: The canards near the nose aren't for control. Because the aircraft is flown by autopilot using terrain-following radar (TFR), weaving into and out of mountains, autopilot makes many quick pitch adjustments. The canards are to cancel out sine waves in the structure of the fuselage.

It can carry a whole lotta' bombs:

24 nuclear bombs, 48 JDAMs, 84 Mk82 bombs, or 48 AGM missiles.

100 were built, 66 remain.

I leave with my current desktop background: