The National Guard Association of the United States accused Army leaders of refusing to create a commission that could show reserve force are cheaper to maintain than the active duty.
The WikiLeaks source was sentenced to 35 years in prison.
Senators John McCain and Kelly Ayotte used Tuesday's Armed Services Committee hearing to probe the Army Chief of Staff for statements on the airplane's value.
A proposed plan would cut 19,000 soldiers and the Apache fleet from the Guard.
If sequestration is not lifted by 2016, the Army will trim its active duty end strength.
Four died, including the shooter, and 16 others were injured.
Hagel said sending another permanent Army brigade to Europe could be a possibility.
Senate Armed Services Committee Chairman Carl Levin on Thursday issued a stern warning to the Army not to try to bypass Congress to close bases.
Sen. Bernie Sanders (I-Vt.) said Thursday the United States has to do “a heck of a lot more” to help people with mental health issues.
His comment came a day after a gunman killed three people and himself, and wounded 16 others on the Fort Hood, Texas, Army base Wednesday afternoon.
Army Secretary John McHugh said the Fort Hood gunman saw a psychiatrist last month.