How are the views of the narrators similar in “facing it” and “not a dove, but no longer a hawk”?
both narrators discuss the negative impact of war on the innocent civilians.
both narrators oppose american involvement in the vietnam war.
both narrators are critical of the treatment of veterans after the vietnam war.
both narrators are saddened by the harsh realities of the vietnam war.

Both narrators discuss the negative impact of war on the innocent civilians.

The last answer has some truth to it also -- that both narrators were saddened by the harsh realities of the Vietnam War.  But that answer is a bit vague, whereas the negative impact of the war on innocent civilians points to a more specific issue in both pieces.

In his poem, "Facing It" (1988), Yusef Komunyakaa writes in reflection on the war as one standing in front of and reflecting on the Vietnam Veterans Memorial.  Robin Ekiss of the Poetry Foundation has said of "Facing It" - "The spare simplicity of Komunyakaa’s poem ultimately lays bare the consequences and costs of the war."  The loss of lives of the 58,022 American soldiers memorialized on the stone wall monument only begins to testify to all the damage the war caused to human beings.

In his essay, "Not a Dove, But No Longer a Hawk" (1966), New York Times correspondent Neil Sheehan told of his experiences viewing the war close up from 1962 to 1966.  "Americans, because they are Americans," he wrote, arrive in Vietnam full of enthusiasm and with the best of intentions.  After a prolonged period of residence, they leave with their enthusiasm a victim of the cynicism that pervades Vietnamese life and with their good intentions lost somewhere in a paddy field."  His own years in Vietnam brought Sheehan to realize that Americans were defending a government that did not deserve to be defended, one that was unable to win support from its own people or meet the needs of its people.  He wrote:  “Our responsibility for prolonging what is essentially a civil conflict may be one of the major reasons for the considerable amount of confusion, guilt and soul-searching among Americans over the Vietnam war.”   Civilians in Vietnam were not being helped by the war; the war was increasing devastation for them.