Throughout her many years of association with numerous Army units, Diane's efforts on behalf of soldiers and their families contributed significantly to the well-being of Army families.Through her participation in Army family support programs she acted as a proponent for the family and its welfare in the army community. While stationed with her husband in Hawaii, she was actively involved in a prayer ministry where she visited and prayed with injured and terminally ill patients at the Army Medical Center. Immediately after the 9/11 terrorist attack on the Pentagon, she and her daughter, Whitney, volunteered countless hours on the phones at the Fort Myer Family Center (adjacent to the Pentagon) to answer inquiries and assist families and friends of those affected by the attack.In following months, they visited wounded soldiers from both the Afghanistan and Iraq wars at Walter Reed Hospital and hosted some in her home.

As an unofficial ambassador to the Foreign Attaché community she worked tirelessly on behalf of the army and the nation. Diane opened her home and hosted numerous senior foreign military and civilian officials for dinners and receptions. She also acted as hostess for the Army's most important annual social events for the Washington Corps of Military Attaches——the Spring Attaché Receptions in May 2002 and June 2003, and the Fall Attaché Reception in September 2002. As a result of her gracious manner, warm personality, keen insight, and meticulous attention to detail, all of these occasions were flawless and set the stage for warm conversation and improved relations. Diane attended over sixty embassy receptions and dinners, at many of which her husband was the official representative of the Secretary of the Army and the Chief of staff, Army. Her attendance at these events helped to not only maintain, but also increase Army prestige within the international military and diplomatic community in Washington, DC. Diane also participated in numerous spousal events during Chief of Staff, Army Counterpart Visits, assisting the wife of the Army's Chief of Staff in showcasing American history and culture to visiting spouses of Chiefs of foreign armies. Her efforts contributed immeasurably to the success of the Headquarters, Department of the Army attaché Program and the Chief of Staff, Army Counterpart Visit Programs. The success of these programs is heavily dependent on the relationships fostered and developed through formal social contacts. Diane's able and generous support was invaluable in creating and maintaining army success in this arena. Diane and Bob have a daughter, Whitney Casstevens, in New York City and a son, Bo, in Boston, Mass.