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# AWS::EC2::EC2Fleet ReservedCapacityOptionsRequest

Defines EC2 Fleet preferences for utilizing reserved capacity when DefaultTargetCapacityType is set to `reserved-capacity`.
**Note** 
This configuration can only be used if the EC2 Fleet is of type `instant`.
When you specify `ReservedCapacityOptions`, you must also set `DefaultTargetCapacityType` to `reserved-capacity` in the `TargetCapacitySpecification`.
For more information about Interruptible Capacity Reservations, see [Launch instances into an Interruptible Capacity Reservation](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-fleet-launch-instances-interruptible-cr-walkthrough.html) in the *Amazon EC2 User Guide*.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "[ReservationTypes](#cfn-ec2-ec2fleet-reservedcapacityoptionsrequest-reservationtypes)" : {{[ String, ... ]}}
}
```
### YAML

```
 [ReservationTypes](#cfn-ec2-ec2fleet-reservedcapacityoptionsrequest-reservationtypes): {{
 - String}}
```
## Properties

`ReservationTypes` 
The types of Capacity Reservations to use for fulfilling the EC2 Fleet request. 
*Required*: No 
*Type*: Array of String 
*Allowed values*: `interruptible-capacity-reservation` 
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