Other messages are more angry - an upraised middle finger on one bomb as the US pursues Osama bin Laden's terrorism network and his Taleban sympathisers.
However, the pilots - who will not be named for fear of reprisals against their families - say their aim is not revenge but to "create a more favourable condition to pursue terrorists".
Jets bombed the southern stronghold of Kandahar and Kabul yesterday afternoon (NZT) as US forces, confident of air superiority, struck in daylight for the first time.
In Kabul, residents huddling in underground shelters with little food or water endured more explosions after a second night of raids aimed at airfields, anti-aircraft units, communications centres and terrorist camps.
Four Afghan United Nations workers were killed when a missile destroyed the UN-financed Afghan Technical Consultancy, which is helping to demine one of the world's most heavily mined countries.
The night strikes were aimed at television towers just outside the city but one bomb fell near the main hospital.
In Kandahar US strikes hit the former house of Mullah Mohammad Omar, spiritual leader of the Afghanistan's ruling Taleban, but he survived, said Taleban officials.
Also targeted were the northern cities of Mazar-e-Sharif and Kunduz, where anti-Taleban forces are poised to attack.
The daylight raid on Kabul targeted airport radar installations. Yesterday's strikes by B-2 stealth planes, B-1Bs and 10 fighter aircraft were less intense than the first night of bombing, when 31 targets were struck.
Fifteen Tomahawk missiles were also fired yesterday. With a price tag of more than $1 million each, the cost of cruise missiles launched in the first two nights approaches the Taleban's $90 million annual budget.
The Taleban vowed to wage a drawn-out guerrilla war after the attacks, which it said had killed 25.
"We will fight the Americans the way we fought the Russians," said a Taleban spokesman, referring to the ill-fated 1979-89 Soviet occupation.
US Defence Secretary Donald Rumsfeld tried to lower expectations of a quick military victory, saying the airstrikes were unlikely to "rock the Taleban back on their heels".
The cruise missiles were "not a silver bullet" in what would be a long military, economic and political war on terrorism.
Mr Rumsfeld said the US would continue to drop food packages to displaced Afghans as the military strikes resumed.
Earlier, US hints that it might broaden its campaign strained its shaky coalition of allies. Washington told the UN Security Council that it was still looking into who was behind the terrorist attacks, and might have to launch military strikes on other nations and groups.
Britain quickly said the present action was limited to Afghanistan.
European diplomats said any attempt to target Iraq would blow apart the coalition and alienate not only Muslim states but key European partners, including Russia.
Although several Arab and Muslim leaders have backed the war on terrorism, the strikes on Afghanistan sparked anti-US demonstrations from the Middle East to Jakarta. Two Palestinian students died in the Gaza Strip and there were protests in Egypt, Oman, Pakistan and Indonesia.
