Democratic presidential candidate Barack Obama says he doesn't wear an American flag lapel pin because it has become a substitute for "true patriotism" since the Sept. 11, 2001, terrorist attacks.

Asked about it Wednesday in an interview with KCRG-TV in Cedar Rapids, Iowa, the Illinois senator said he stopped wearing the pin shortly after the attacks and instead hoped to show his patriotism by explaining his ideas to citizens.

"The truth is that right after 9/11 I had a pin," Obama said. "Shortly after 9/11, particularly because as we're talking about the Iraq war, that became a substitute for I think true patriotism, which is speaking out on issues that are of importance to our national security.

"I decided I won't wear that pin on my chest," he said in the interview. "Instead, I'm going to try to tell the American people what I believe will make this country great, and hopefully that will be a testament to my patriotism."

On Thursday, his campaign issued a statement: "We all revere the flag, but Senator Obama believes that being a patriot is about more than a symbol. It's about fighting for our veterans when they get home and speaking honestly with the American people about this disastrous war."

Obama was campaigning in Iowa Thursday, the second day of a four-day trip to the early voting state.

At one stop, he called for new restrictions on deployment of National Guard and Reserve troops along with an expansion of benefits for them and their families.

"I will not be a president who extends tours for our Guard units overseas while Americans are stranded on rooftops right here at home," Obama said.

He said he would require "a period of rest and standard of readiness" before troops could be redeployed. He called for the head of the National Guard to be elevated to four-star rank and given a seat among the Joint Chiefs of Staff to reflect the heavy reliance on Guard soldiers and reservists during the Iraq war.

Since 2001, Obama said, more than 580,000 reservists have been activated, a level not seen since World War II.

In making his case, Obama pointed to an Iowa unit in which members learned from family and friends back home that their deployment had been extended. That unit — the 1st Battalion of the 133rd Infantry — recently returned after a 22-month deployment in Iraq.

"When we've got service members who have to find out that their tour has been extended in a phone call home, we're not keeping that trust and we're not keeping this country safe," Obama said.

He also called for increased mental health services, including screening and treatment for post-traumatic stress disorder. He said nearly half of the National Guard troops returning from Iraq and Afghanistan suffer from psychological problems, yet little emphasis is put on treating those disorders.

"We're not providing adequate treatment, screening and benefits," said Obama. "We need more mental health professionals and more training to recognize the signs."