Note to media reporters:

The Hopi are different from the Navajo. And the Anishinabe, and the Cherokee and the Inuit and the Cree and the Lakota and the Menominee and the Cheyenne and the Chickasaw and the Apache and the Deleware and the Ho Chunk and the Iroquois and the Mohican and the...well you get the point.

Although the reservation Lori Ann Piestewa comes from is completely surrounded by a Navajo reservation (see map) that does not mean that they are the same. Thanking her Hopi relatives for helping with the military code in WWII makes you sound ill-informed.

Some information I found when researching this issue:

There are 11,156 Hopi officially registered with the AZ tribe. 9,000 of them live on the reservation there. 56 Hopi men and women are members of the United States Military and 48 of them are currently stationed in Iraq. That means that approximately 1 out of every 250 people are in Iraq. That seems like an amazingly high ratio to me.

Sources: Official Website of the Hopi Tribe
* Demographics
* History
Native American Nations Homepage List