以下是美国签证在职证明的英文模板：

To Whom It May Concern,

This letter serves as confirmation that [Full Name] is currently employed as a [Position] at [Company Name]. [He/She] has been employed with our company since [Start Date] and is currently working in our [Department/Division].

As a valued member of our team, [Full Name] is responsible for [Job Duties]. [He/She] has consistently demonstrated excellent [Skills/Abilities] and has made valuable contributions to our organization.

At this time, [Full Name] has expressed a desire to travel to the United States for [Purpose of Travel]. We fully support [his/her] decision to pursue this opportunity and can confirm that [he/she] will return to [his/her] position with our company upon completion of [his/her] trip.

Should you require any further information or clarification, please do not hesitate to contact us.

Sincerely,

[Your Name]

[Your Title]

[Company Name]

以上是美国签证在职证明的英文模板，希望对您有所帮助。